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[探索发现] 【整理】2010-02-10 地球的起源 EarthMade—5

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[探索发现] 【整理】2010-02-10 地球的起源 EarthMade—5

本帖最后由 sylvia_qian 于 2010-2-11 11:58 编辑

 

  How The Earth Was Made  

The series of HOW THE EARTH WAS MADE travels the globe to reveal the geological processes that have shaped our planet. We will look at a single location and examine how the features that we see today have formed over millions of years—whether by colliding continents, volcanic eruption or the abrasive power of vast ice sheets. These processes, which intimately affect the way we live today, have been lost in the mists of time. Using the clues that were left behind, combined with expert evidence from geologists in the field, this series rolls back the millennia to see how the slow but immensely powerful forces of geology have shaped our world.

 

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【整理】sylvia_qian

For reference only

 

One of the few places that shelters a clue to the Sahara's birth is the White Desert. In this hauntingly beautiful sight, dramatic shapes have been sculpted out of rock.

 

-Oh, this is great. It's got that mushroom shape.

 

These structures are called "Yardangs", and they are a kind of hourglass that could help measure the age of the desert.

 

-This rock is another piece of evidence that this desert was once under the ocean. It's actually a chalk made up of billions of little marine microorganisms. These chalks are actually really easy to erode, that's one reason things are so beautifully sculpted by the wind.

 

But the wind is a brutal creator. It picks up sand and hurls it at the Yardang.

 

-When wind scours or sandblasts the rocks, this is the characteristic shape that we get, this mushroom shape, narrower in the middle. That's because the wind goes faster as you move up from the ground. So it can erode harder, but it has less sand in it since it picks up the sand from the ground. So where we get the most erosion, where the rock is narrowest, is where we have the best mix of fast wind and the most sand.

 

40 million years ago the top of the Yardangs formed part of the solid seafloor. But the wind picked up once the Sahara turned to desert and the process of carving out these shapes began. Figuring out how long that took could help pinpoint the age of the desert.

 

-It's hard to say precisely how long it will take for the wind to carve these all out. Something like this about 15 feet high, soft rock, you look at it, may be only tens to a few hundreds of thousands of years. But to carve out the whole away is depression. You've gotten need at least a million years.

 

But geologists suspect the Sahara is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature, "sand dunes". Here in the Sahara, sand storms kick up that can last for 4 days. The sand is hurled across the terrain. Over hundreds of thousands of years, it accumulates into dunes that can tower 50 stories high. Perhaps these mountains of sand hold the secret of the desert's great age.

 

-As soon as the climate becomes arid, you can start building dunes. And if we want to know how long that took, we can try in date the dunes themselves, but that's really hard.

 

What's hard is that these dunes are constantly shifting, the wind that builds them also blows them away, moving them an average of 50 feet a year. To get a precise age for the desert, scientists need to follow the sand to the end of its journey.

 


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[Homework]2010-02-10 地球的起源 EarthMade—5

One of the few places that shelters a clue to the Sahara’s birth is white desert. In this hauntingly beautiful sight, dramatic shapes have been sculpted out of rock.

Oh, this is great. It’s got that mushroom shape.

These structures are called “Yardangs”, and they are a kind of hourglass that could help measure the age of the desert.

This rock is another piece of evidence this desert was once under the ocean. It’s actually a chalk made up of billions of little marine micro organisms. This chalks are actually easy to erode, that’s one reason things are so beautifully sculpted by the wind.

But the wind is a brutal creator. It picks up sand and hurls it at the Yardang.

When wind scours or sandblast the rocks, this is the characteristic shape that we get, this mushroom shape. Nearly / in the middle. That’s because the wind goes fast as you move up from ground. So it can eroded harder, but it has sand in it since it picks up the sand from the ground. So what we get the most erosion was the rock’s narrowest is what we have the best mix of fast wind and most sand.

40 million years ago the top of the Yardang formed part of the solid seafloor. But the wind picked once the Sahara turned to desert and the process of carving out the shapes began.
Figuring out how long that took could help pinpoint the age of the desert.

It’s hard to say precisely how long it will take for the wind to carve these all out. Something like this about 15 feet high soft rock, it looked at may be only tens to a few hundreds of thousands of years.  But the carve out the whole away these depression. You’ve got to need at least a million years.

But geologists suspect the Sahara is older than a million years. In their search for more accurate date, they next turn to its most iconic feature, “sand dunes”. Here in the Sahara, sand storms kick up that can last for 4 days. The sand is hurled across the terrain. Over hundreds of thousands of years, it accumulates into dunes that can tower 50 stories high. Perhaps these mountains of sand hold the secret of desert’s great age.

As soon as the climate becomes /, you can start building dunes. And if we want to how long that took, we can trying and dates the dunes themselves, but that’s really hard.

What’s hard is that these dunes are constantly shifting, the wind that builds them also blows them away, moving them an average of 15 feet a year. To get a precise age for the desert, scientists need to follow the sand to the end of its journey.   

This post was generated by put listening repetition system,  Check the original dictation thread!
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本帖最后由 fire0204 于 2010-2-10 09:42 编辑

Homework

One of the few places that shelters are clue to the Sahara’s birth is the white desert. In this hauntingly beautiful site, dramatic shapes have been sculpted out of rock.

-Oh, this is great, it’s got there, mushroom shape.

These structures are called yardeys and they are a kind of hour glass that could help measure the age of the desert.

-This rock is another piece of evidence that this desert was once under the ocean, exactly a chalk made up of billion of little marine micro organisms. These chalks are actually easy to arose, that’s one reason things are so beautifully sculpted by the wind.

But the wind is a brutal creator. It picks up sand and hoisted the yardey.

-When wind sky hours or sand glass the rocks, this is the characteristics shape that we get this mushroom shape, nearer where in the middle. That’s because the wind goes faster as you move up from the ground, so you can road harder but has less sand in it since it picks up the sand from the ground. So where we get the most range with the rock’s narrowest is where we have the best mix of fast wind and most sand.

40 million years ago, the top of the yard angles formed part of the solid sea floor, but the wind picked up once the Sahara turned to desert and the process of carving out these shapes began. Figuring out how long that took could pinform the age of the desert.

-It’s hard to say precisely how long it would take for the wind to carve these all out, something like this about 15 feet high, soft rock you look at, maybe only tense to a few hundred of thousands of years, but to carve out the whole waste depression, you’ve gotta need at least a million years.

But geologists suspect the Sahara is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature—sand dunes.

Here in the Sahara, sandstorms kick-up can last for four days. The sand is horrid across the terrain. Over hundreds of thousands of years, it accumulates into duns that can tower 50 stories high. Perhaps these mountains of sand holds the secret of the desert’s great age.

-As soon as the climate becomes erage, you can start building dunes, and if we wanna know how long that took, we can try in a day that dunes themselves, but that’s really hard.

What’s hard is that these dooms are constantly shifted. The wind that builds them also blows them away. Moving them at average 50 feet a year, to get a precise age for the desert, scientists need to follow the sand to the end of its journey.
实现无障碍英语沟通
On csufor

One of the few places that shelters a clue to the Sahara'sbirth is the white desert. In this hauntingly beautiful sight, dramaticshapes have been sculpted out of rock.


Oh, this is great. It's got that mushroom shape.

These structures are called "Yardangs", and they are a kind of hourglass that could help measure the age of the desert.

This rock is another piece of evidence this desert was onceunder the ocean. It's actually a chalk made up of billions of littlemarine micro organisms. This chalks are actually really easy to erode, that'sone reason things are so beautifully sculpted by the wind.

But the wind is a brutal creator. It picks up sand and hurls it at the Yardang.

When wind scours or sandblast the rocks, this is thecharacteristic shape that we get, this mushroom shape. Narrower in themiddle. That's because the wind goes faster as you move up from the ground.So it can erode harder, but it has much sand in it since it picks up thesand from the ground. So where we get the most erosion was the rock'snarrowest is where we have the best mix of fast wind and the most sand.

40 million years ago the top of the Yardangs formed part of thesolid seafloor. But the wind picked up once the Sahara turned to desertand the process of carving out the shapes began. Figuring out how long that took could help pinpoint the age of the desert.

It's hard to say precisely how long it will take for the windto carve these all out. Something like this about 15 feet high softrock, it looked like may be only tens to a few hundreds of thousands ofyears.  But to carve out the whole away these impression. You've gotto need at least a million years.

But geologists suspect the Sahara is older than a millionyears. In their search for more accurate date, they next turn to itsmost iconic feature, "sand dunes". Here in the Sahara, sand storms kickup that can last for 4 days. The sand is hurled across the terrain.Over hundreds of thousands of years, it accumulates into dunes that cantower 50 stories high. Perhaps these mountains of sand hold the secretof the desert's great age.

As soon as the climate becomes /, you can start building dunes.And if we want to know how long that took, we can trying  date the dunesthemselves, but that's really hard.

What's hard is that these dunes are constantly shifting, thewind that builds them also blows them away, moving them an average of15 feet a year. To get a precise age for the desert, scientists need tofollow the sand to the end of its journey.
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Homework

One of the few places that shelter a clue to the Sahara's birth is the white desert. In this hauntingly beautiful site, dramatic shapes have been sculpted out of rock.

Oh, this is great. It's get that... mushroom shape.

These structures are called Yardans and they're a kind of hour glass that could help measure the age of the desert.

This rock is another piece of evidence this desert was once under the ocean. It's actually a chalk made up of billions of little marine micro organisms. These chalks are actually very easy to erode. That's one reason things were so beautifully sculpted by the wind.

But the wind is a brutal creator. It picks up sand and hurls it at the Yardan.

When win scours or sandblasts the rocks, this is the characteristic shape that we get, this mushroom shape, narrower in the middle. That's because the wind goes faster as it moves up from the ground so it can erode harder but it has less sand in it since it picks up the sand from the ground. So where we get the most erosion where the rock is narrowest is where we have the best mix of fast wind and the most sand.

40 million years ago, the top of the Yardans formed part of the solid sea floor. But the wind picked up once the Sahara turned into desert and the process of carving out these shapes began. Figuring out how long that took could help pinpoint the age of the desert.

It's hard to see precisely how long it would take for the wind to carve this all out. Something like this about 15 feet high soft rock, you're looking at maybe only tens to a few hundred thousands of years. But to carve out the whole oasis of depression you've gotta need at least a million years.

But geologists suspect the Sahara is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature, sand dunes. Here in the Sahara, sand storms kick up that can last for 4 days. The sand is hurled accross the terrain. Over 100s of 1000s of years, it accumulates into dunes that can tower 50 stories high. Perhaps these mountains of sand hold the secrets of the desert's great age.

As soon as the climate becomes air age???, you can start building dunes and if we want to know how long that took, we can try in dating the dunes themselves, but that's really hard.

What's hard is that these dunes are constantly shifting. The wind that builds them also blows them away, moving them an average of 15 feet a year. To get a precise age for the desert, scientists need to follow the sand to the end of its journey.
本帖最后由 imitation 于 2010-2-10 11:29 编辑

HOMEWORK

One of the few places that shelters a clue to the Sahara's birth is the White Desert.In this hauntingly beautiful site,dramatic shapes have been sculpted out of rock.
Oh, this is great, it's got there, mushroom shape.
These structures are called Yardangs and they are a kind of hourglass that could help measure the age of the desert.
This rock is another piece of evidence that this desert was once under the ocean, exactly a chalk made up of billions of little marine microorganisms. These chalks are actually really easy to erodes, that's one reason things are so beautifully sculpted by the wind.
But the wind is a brutal creator. It picks up sand and hurls it at the Yardang.
When wind scours or sandblasts the rocks, this is the characteristics shape that we get this mushroom shape, narrower in the middle. That's because the wind goes faster as it move up from the ground, so it can erode harder but has less sand in it since it picks up the sand from the ground. So where we get the most erosion with the rock's narrowest is where we have the best mix of fast wind and most sand.
40 million years ago, the top of the Yardangs formed part of the solid sea floor, but the wind picked up once the Sahara turned to desert and the process of carving out these shapes began. Figuring out how long that took could helf pinpoint the age of the desert.-It’s hard to say precisely how long it would take for the wind to carve these all out, something like this about 15 feet high, soft rock you look at, maybe only tens to a few hundred of thousands of years, but to carve out the whole waste depression, you've gotta need at least a million years.
But geologists suspect the Sahara is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature—sand dunes.Here in the Sahara, sandstorms kick up that can last for four days. The sand is hurled across the terrain. Over hundreds of thousands of years, it accumulates into dunes that can tower 50 stories high. Perhaps these mountains of sand hold the secret of the desert's great age.
As soon as the climate becomes ***, you can start building dunes, and if we wanna know how long that took, we can try indate the dunes themselves, but that's really hard.
What's hard is that these dooms are constantly shifted. The wind that builds them also blows them away. Moving them at average 50 feet a year, to get a precise age for the desert, scientists need to follow the sand to the end of its journey.
There is no white or black in blue.
Homework

One of the few places that shelters a clue to the Sahara's birth is the white desert. In this hauntingly beautiful sight, dramatic shapes have been sculpted out of rock.

"Woo, this is great! let's get that. mushroom shape."

This structures are called ya dens. And they're a kind of hourglass that could help measure the age of the desert.

"This rock is another piece of evidence that this desert was once under the ocean, _ a chock made up of billions of little marine micro organisms. This chocks are actually really easy to arose so that's one reason things are so beautifully sculpted by the wind."

But the wind is a brutal creator. It picks up sand and hurls it of the ya den.

"When wind scours or sand less the rocks this is a characteristic shape that we get this mushroom shape narrower in the middle. That's because the wind goes faster as you move up from the ground so it can erode harder but has less sand in it, since it picks the sand from the ground. So where we get the most erosion where the rock is the narrowest is where we have the best makes of fast wind and most sand."

40 million years ago the top of the ya dens formed part of the solid sea floor. Wind picked up once the Sahara turned to desert and _ of carving out these shapes began. Figuring out how long that took could help _ point the age of the desert.

"It hardly to say precisely how long it will take for the wind to carve these all out. Something like this about 15 feet high soft rock you look it may be only tens to if hundreds of thousands of years, but to carve out the whole away, it's a depression you got to need at least millions of years.

But geologists suspect that Sahara is older than a million years. In their search for more accurate date, they next turn to its most iconic feature- sand dooms. Here in Sahara, sand storms kick up that can last for four days. the sand is hurled across the terrain. over hundred of thousands of years it accumulates into dooms that can tower 50 stories high. Perhaps this mountains of sands hold the secret of the desert's great age.

"As soon as the climate becomes _ you can start building dooms. And if we want to know how long that took, we can try in date the dooms themselves. But that's really hard."

What's hard? Is that these dooms are constantly shifting, the wind that builds them also blows them away, moving them in average of 50 feet a year? To get the precise age for the desert, scientists need to follow the sand to the end of its journey.
实现无障碍英语沟通
on fraternite

One of the few places that shelters a clue to the Sahara's birth is the White Desert. In this hauntingly beautiful sight, dramatic shapes have been sculpted out of rock.

-Oh, this is great. It's got that mushroom shape.

These structures are called "Yardangs", and they are a kind of hourglass that could help measure the age of the desert.

-This rock is another piece of evidence that this desert was once under the ocean. It's actually a chalk made up of billions of little marine microorganisms. These chalks are actually really easy to erode, that's one reason things are so beautifully sculpted by the wind.

But the wind is a brutal creator. It picks up sand and hurls it at the Yardang.

-When wind scours or sandblasts the rocks, this is the characteristic shape that we get, this mushroom shape, narrower in the middle. That's because the wind goes faster as you move up from the ground. So it can erode harder, but it has less sand in it since it picks up the sand from the ground. So where we get the most erosion where the rock is narrowest is where we have the best mix of fast wind and the most sand.

40 million years ago the top of the Yardangs formed part of the solid seafloor. But the wind picked up once the Sahara turned to desert and the process of carving out these shapes began. Figuring out how long that took could help pinpoint the age of the desert.

-It's hard to say precisely how long it will take for the wind to carve these all out. Something like this about 15 feet high soft rock, you look at it, may be only tens to a few hundreds of thousands of years.
But to carve out the whole away
is depression.
You've gotten need at least a million years.


But geologists suspect the Sahara is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature, "sand dunes". Here in the Sahara, sand storms kick up that can last for 4 days. The sand is hurled across the terrain. Over hundreds of thousands of years, it accumulates into dunes that can tower 50 stories high. Perhaps these mountains of sand hold the secret of the desert's great age.

-As soon as the climate becomes average, you can start building dunes. And if we want to know how long that took, we can try/ in date the dunes themselves, but that's really hard.

What's hard is that these dunes are constantly shifting, the wind that builds them also blows them away, moving them an average of 50 feet a year. To get a precise age for the desert, scientists need to follow the sand to the end of its journey.
普特听力大课堂
hw

one of the few places that shelter a clue to the  S's birth is the White Desert. In this hauntingly beautiful site, dramatic shapes have been sculpted out of rock.

Oh, this is great. mushroom-shape.

These structures are called Y. And they are a kind of hourglass that could help to measure the age of the desert.

This rock is the another piece of evidence that this desert was once under the ocean. made of billions of little marine microorganism. These c* are actually really easy to erode. That's one reason things are so beautifully sculpted by the wind.  

But the wind is a brutal creator. It picks up sand and hurls it at Y.

When wind scours or * the rocks, this is the characteristic shape that we get this mushroom shape, narrow in the middle. That's because the wind goes faster as you move up from the ground,so it can erode harder. But it has less sand in it since it picks up sand from the ground. So we'll get the most erosion where the rock is the narrowest is where we have the best mix of fast wind and most sand.

Forty million years ago, the top of the Y formed part of the solid seafloor. But the wind picked up the once S into desert and the process of carving out these shapes began. Fighuring out how long that took could help pinpoint the age of the desert.

It's hard to say precisely how long it will take for the wind to carve this all out. Something like this is about 15 feet high, soft rock, it'll look maybe only tens to a few hundreds of thousands of years. But to carve out the whole * you've got at least a million years.

But geologists suspect that S is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature--- sand dunes. Here in the S, sand storms * can last for four days. The sand is hurled across the terrain. Over hundreds of thousands of years, they accumulate into dunes that can tower 50 storeys high. Perhaps these mountains of sand hold the secret of the desert's great age.

As soon as the climate becomes average, you can start building dunes. And if we want to know how long that took we can try * date dunes themselves, but that's really hard.

What's hard is that these dunes are constantly shifting. The wind that builds them also blows them away, moving them an average of 50 feet a year. To get a precise age for the desert, scientists need to follow the sand to the end of its journey.
好栏目推荐之美国口语俚语
HOMEWORK

One of the few places that shelters are clue to the Sahara’s birth is the white desert. In this hauntingly beautiful site, dramatic shapes have been sculpted out of rock.

-Oh, this is great, it’s got there, mushroom shape.

These structures are called yardeys and they are a kind of hour glass that could help measure the age of the desert.

-This rock is another piece of evidence that this desert was once under the ocean, exactly a chalk made up of billion of little marine micro organisms. These chalks are actually easy to arose, that’s one reason things are so beautifully sculpted by the wind.

But the wind is a brutal creator. It picks up sand and hoisted the yardey.

-When wind sky hours or sand glass the rocks, this is the characteristics shape that we get this mushroom shape, nearer where in the middle. That’s because the wind goes faster as you move up from the ground, so you can road harder but has less sand in it since it picks up the sand from the ground. So where we get the most range with the rock’s narrowest is where we have the best mix of fast wind and most sand.

40 million years ago, the top of the yard angles formed part of the solid sea floor, but the wind picked up once the Sahara turned to desert and the process of carving out these shapes began. Figuring out how long that took could pinform the age of the desert.

-It’s hard to say precisely how long it would take for the wind to carve these all out, something like this about 15 feet high, soft rock you look at, maybe only tense to a few hundred of thousands of years, but to carve out the whole waste depression, you’ve gotta need at least a million years.

But geologists suspect the Sahara is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature—sand dunes.

Here in the Sahara, sandstorms kick-up can last for four days. The sand is horrid across the terrain. Over hundreds of thousands of years, it accumulates into duns that can tower 50 stories high. Perhaps these mountains of sand holds the secret of the desert’s great age.

-As soon as the climate becomes erage, you can start building dunes, and if we wanna know how long that took, we can try in a day that dunes themselves, but that’s really hard.

What’s hard is that these dooms are constantly shifted. The wind that builds them also blows them away. Moving them at average 50 feet a year, to get a precise age for the desert, scientists need to follow the sand to the end of its journey.
+ U ~
HW
One of the few places that shelters a clue to the Sahara’s birth is the white desert. In this hauntingly beautiful site, dramatic shapes have been sculpted out of rock.
This is great; it’s get that mushroom shape.
This structures are called Yardangs, and they are a kind of hourglass that could help measure the age of the desert.

This rock is another piece of evidence; this desert was once under the ocean. / a chalk made up of billions of little marine micro-organisms. This chalks are actually really easy to erode, that’s one reason of things are so beautifully sculpted by the wind.
But the wind is a brutal creator, it picks up sand and holds at the Yardang.
When wind scourers or sandblast the rocks, this is the characteristic shape that we get this mushroom shape. Narrower were in the middle, that’s because the wind goes faster. As you move up from the ground, so it can erode harder. But has less sand / since it picks up the sand from the ground. So where we get the most erosion, where the rock is narrowest, is where we have the best mix of fast wind in the most sand. 40 million years ago, the top of the Yardang’s formed part of the solid sea floor. But the wind picked up once the Sahara turned the desert and process of carving out the shapes begin.
Figuring out how long that took could help pinpoint the age of the desert.
It’s hard to say precisely how long it will take for the wind to carve this all out, something like this about 15 feet high, soft rock, you look at, maybe only tens to a few hundreds of thousands of years. But to carve out the whole / depression, you gotta need at least a million years.

But geologists suspect the Sahara is older than a million years. In their search for a more accurate date, they next turn to its most iconic feature, sand dunes.
Here in the Sahara, sand storms kick-up can last for 4 days. The sand is horrid to cross the terrain. Over hundreds of thousands of years, it accumulates into dunes that can tower 50 stories high. Perhaps, these mountains of sand hold the secret of the desert great age.
As soon as the climate becomes air raging, you can start building dunes. And if you wanna know how long that took, we can try in date the dunes themselves but that’s really hard. What’s hard is that these dunes are constantly shifting, the wind that builds them, also blows them away. Moving them average 50 feet a year, to get a precise age for a desert, scientists need to follow these sand to the end of its journey.
要跳多少次才能飞起来?

[Homework]2010-02-10 地球的起源 EarthMade—5

          One of the few places the shelters a clue to the Sahara's is the White Desert .In this hauntingly beautiful sight,dramatic shapes is been sculpted out of rock.
         Oh ,this is great ,it's got that mushroom shape. These structures are call Yardangs ,and they are a kind of hourglass ,they could help measure the age of the desert.
        This rock is another piece of evidence of this desert was once under the ocean.It's actually a chalk made up of the billions of the little marrine microorganisms .These chalks really easy to !@#!@ ,that's one reason things thinks so beautifully sculpted by the wind .
         But the wind is a brutal creator .It picks up sand and hurls at the Yardang .
         When winds scours or sandblasts the rocks ,this is the characteristic shape that we get this mushroom shape narrower were in the middle .That's because the wind goes faster as you move up from the ground ,so it can erode harder ,but it has less  sand in it since it picks up the sand from the ground ,so when we get the most erosion where the rock is narrowest is where we have the best mix of fast wind and the most sand .
        40 millions years ago, the top of the Yardangs formed part of the solid seafloor .But the wind picked up once the Sahara  turned to desert and the process of carving out of these shapes began.Figuring out how long that took could help pinpoint the age of the desert.
         It is hard to say precisely how it will take for the wind  to carve these all out, something like these about 15 feet high soft rock, it looked may be only tens to a few hundreds of thousands of years.But to carve out the whole away is depression .You've gotten need at least a million years .
          But geologists suspect the Sahara is older than a million years .In their search for a more accurate date ,they next turn to its most iconic  feature .sand dounes   here is in the Sahare ,sand storms kick up that can last for 4 days .The sand is hurled across the terrain .Over hundreds of the thousands of years ,it accumulates into dunes that can tower 50 stories high.Perhaps these mountains of sand hold the secret of the desert's great age.
           As soon as the climate becomes average ,you can start building dunes .And if we want know how long that took ,we can try in date the dunes themselves but that's really hard .
          What's hard is that these dunes are constantly shifting ,the wind that builds them also blows them away ,moving them an average of 50 feet a year.To get a precise age for the desert ,scientists need to follow the sand to end of its journey.............
         

This post was generated by put listening repetition system,  Check the original dictation thread!
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homework
One of the few places that shelter a clue to the sahara's birth is the white desert.In this hauntingly beautiful sight dramatic shapes have been sculpted out of rock.
Oh,it's great.It's like that mashroom shape.
These structures are called "yadangs".They are a kind of hours glass that could help measure the age of the desert.
This rock is another piece of evidence that this desert was once under the ocean.It's actually the chalk made up of billions of little marine micro-organisms.These chalks are actually very easy to arose.That's one reason things are so beautifully sculped by the wind.
But the wind is a brutal creator.It picks up sand and hurls the "yadangs".
When wind scours or sandblasts the rocks,this is the character it shaped that we get this mushroom shape.Narrower in the middle.That's because the wind goes faster as they move up the sand from the ground.So it can erode harder but has less sand in it since in picks up the sand from the ground.So what we get the most erosion was the rock's narrowest is where we have the best mix of a fast wind and most sand.
40 million years ago the top of the "yadangs" formed a part of solid seafloor.But the wind picked up once sahara turned to desert.And the process of carving out the shapes began.Figuring out how long that took could help pinpoint the age of the desert.
It's hard to say precisely how long the wind to carve these all out.Somethings like this about 15 feet high soft rock you are looking at maybe only tens to a few hundreds of thousands of years.But to carve out the whole of these impressions.You've gotta need at least millions of years.
But geologists suspect that the sahara is older than a million years.In their search for more accurate date,the next turn to its most iconic feature,sand dunes.
Here in sahara,sandstorms keep up the last four days.The sand is hurled across the terrain.Over hundreds of thousands of years it accumulated into dunes that can tower 50 storeies high.Herhaps these mountains of sand hold the secret of the desert's great age.
As soon as the climate become the average that you can start building dunes.And if we want to know how long that took,wo can try and date the dunes themselves,but that's really hard.
What's hard is that these dunes are constantly shifting.The wind it's builded also blows them away,moving the average of fifty feet a year,To get a precise age for the desert,sientists need to follow the sand to the end of its journey.

[Homework]2010-02-10 地球的起源 EarthMade—5

One of the few places that shelter the clue to the Sahara's birth is the white desert. In this hauntingly beatiful site, dramatic shapes have been sculpted out of rocks. This is great. It gets that mushroom shape. These structures are called yardangs and they're a kind of hourglass that could help measure the age of the desert. This rock is another piece of evidence that this desert was once under the ocean. It's actually a chalk made up of billions of little marine microorganism. These chalks are actually really easy to erode, that's one reason things are so beautifully sculpted by the wind. The wind is a brutal creator. It picks up sand and hurls it at the yardangs. When wind scours or sunglass the rocks, this is the characteristic shape that we get this mushroom shape near where in the middle. That's because the wind goes faster as it moves up from the ground, so it can erode harder. But it has less sand in it since it picks up the sand from the ground. So where we get the most erosion where the rock is narrowest is where we have the best mix of fast wind and the most sand. 40 million years ago, the top of the yardangs formed part of the solid seafloor. But the wind picked up once the Sahara turned to desert and the process of carving out these shapes begin. Figuring out how long that took could help pinpoint the age of the desert. It's hard to say precisely how long it will take for the wind to carve these all out. Something like this about 15 feet high soft rock. You look at maybe only tens to a few hundreds of thousands of years, but to carve out the whole away of these depression, you've gotta need at least a million years. But geologists suspect that the Sahara is older than a million years. In their search for a more accurate date, they next ture to its most iconic feature, sand dunes. Here in the Sahara, sand storm kicks off that can last four days. The sand is hurled across the terrain. Over hundreds of thousands of years, it accumulates into dunes that can tower 50 storeys high. Perhaps these mountains of sand hold the secret of the desert's great age. As soon as the climate becomes *, you can start building dunes. And if we want to know how long that took, we can try to date the dunes themselver but that's really hard What's hard is that these dunes are constantly shifting, the wind that builds them also blows them away, moving them the average of 50 feet a year. To get a precise age for the desert, scientists need to follow the sand to the end of its journey.
This post was generated by put listening repetition system,  Check the original dictation thread!
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on sylvia_qian

As soon as the climate becomes arid(好像应该是这个吧,后面好像是和you的连音了)
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从不满足只做一朵追随太阳的葵花. 于是,选择行走,永不停歇的行走. 因为,人,总归是要有信念的. 于是,我相信, 在经历千山万水,长途跋涉之后, 自己终会触碰到最直接最温暖的阳光.

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