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[探索发现] 【整理】2010-02-26 地球的起源 EarthMade—12

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[探索发现] 【整理】2010-02-26 地球的起源 EarthMade—12

本帖最后由 sylvia_qian 于 2010-2-28 19:09 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

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The question now for scientists was how quickly the Sahara changed from bountiful back to bone dry.

 

Earlier, deep-sea cores had provided evidence of the moment the Sahara first turned to desert 3 million years ago, and of how since then, a wobble in the earth's axis has made it swing like a pendulum between desert and grassland.

 

Now climate researcher Peter Demenocal is on the hunt for the Sahara's last switch from green to desert, one that occurred in the last 10,000 years. To a geologist, opening this core is like a portal back in time.

 

-Wow, that's amazing. It's much, much redder in the upper part of the core.

 

Laid down flat, every quarter-inch of sediment in the core represents 200 years. The color difference in the sediment is subtle, but to a practiced eye, it's a big clue.

 

-When we split this core, what is surprising about it is that we see this really impressive color change, and it just, it goes from this sort of darker green-brown color in this section of the core, which comes from the clay minerals that make up the deep sea sediments. This bright red sediment actually comes from the windblown dust that's coming off the Saharan desert. As you move along this core, you can see this color maintains itself further up and up into the core. So, right now we are about 7,000 or 8,000 years ago. Boom, here is the drying of the Sahara. You can put your fingers on it, in this core right here, 5,500 years ago.

 

Crucially, the proximity of these two layers reveals how quickly the switch happened.

 

-The transition from a very well watered, wet Sahara that was completely vegetated to one that was much much dryer, that climate transition in this core occurred within one or two centuries.

 

Scientists knew that the Sahara was an ever changing environment. Now for the first time, they have a sense of just how fast it changed.

As the earth wobble shifted, the rain belt away, the return to desert was swift and deadly.

 

-These transitions would have happened almost on a generational time scale that one generation after the next after the next would have realized that where they’re living is no longer sustainable.

 

High above the ruins of the lake settlement, Fekri Hassan has discovered a cave he believes was important to the Saharan people during this sudden change in climate. Perhaps it holds eyewitness clues to what happened.

 

-When I first came into the cave, the sand was as high as this level and I had to crawl in because the sand had covered the whole area. Well, this windblown sand cannot form when the desert is green.

 

Buried in the sand was the first clue, some perfectly preserved animal droppings.


 

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HW

The question now for scientists was how quickly the Sahara changed from bountiful back to bone dry.

Earlier, deep-sea cores had provided evidence of the moment the Sahara first turned to desert 3 million years ago, and of how since then, a wobble in the earth's axis has made it swing like a pendulum between desert and grassland.

Now climate researcher Peter Demenocal is on the hunt for the Sahara's last switch from green to desert, one that occurred in the last 10,000 years. To a geologist, opening this core is like a portal back in time.

Wow, that's amazing. It's much, much redder in the upper part of the core.

Laid down flat, every quarter-inch of sediment in the core represents 200 years. The color difference in the sediment is subtle, but to a practiced eye, it's a big clue.

When we split this core, what is surprising about it is that we see this really impressive color change, and just it goes from this sort of darker green-brown color in this section of the core, which comes from the clay minerals that make up the deep sea sediments. This bright red sediment actually comes from the windblown dust that's coming off the Saharan desert. As you move along this core, you can see this color maintains itself further up and up into the core. So, right now we are about 7,000 or 8,000 years ago. Here is the drying of the Sahara. You can put your fingers on it, in this core right here, 5,500 years ago.

Crucially, the proximity of these two layers reveals how quickly the switch happened.

The transition from a very well watered, wet Sahara that was completely vegetated to one that was much much dryer, that climate transition in this core occurred within one or two centuries.

Scientists knew that the Sahara was an ever changing environment. Now for the first time, they have a sense of just how fast it changed.
As the earth wobble shifted, the rain belt away, the return to desert was swift and deadly.

These transitions would have happened almost on a generation time scale that one generation after the next after nest would have realized that where they’re living is no longer sustainable.

High above the ruins of the lake settlement, Fekri Hassan has discovered a cave he believes was important to the Saharan people during this sudden change in climate. Perhaps it holds eyewitness clues to what happened.

When I first came into the cave, the sand was as high as this level and I had o crawl in because the sand has covered the whole area.
Well, this windblown sand can not form when the desert is green.

Buried in the sand was the first clue, some perfectly preserved animal droppings.
1

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Homework

The question now for scientists was how quickly the Sahara changed from bountiful back to bone dry.

Earlier, deep sea cores have provided evidence of the moment the Sahara first turned to desert 3 million years ago. And of how since then, a wobble in the earth’s ** has made it swing like a penguin between desert and grassland.

Now climate researcher Peter deMenical’s on the hunt for the Sahara’s last switch from green to desert, one that occurred in the last 10,000 years. To a geologist, opening this core is like a portal back in time.

-Wow, that’s amazing, much much redder in the upper part of the core.

Lay down flat, every quarter inch of settlements in the core represents 200 years. The color difference in the settlement is s**, but to a practiced eye, it’s a big clue.

When we split this core, what is surprising about is that we see this is really impressive color change and just it goes from this sort of darker green brown color in this section of the core, which comes from the clay minerals that make up the deep sea settlements. This bight red settlement actually comes from the wind blown dust that’s coming off the Saharan desert. As you come along this core, you can see this color maintained itself, further upper and upper in the core. So, right now we’re about 7 or 8 thousand years ago. Here’s the drying of the Sahara, you can put you finger on it, in this core right here, five and a half thousand years ago.

Crucially, the proximity of these two layers reveals how quickly the switch happened.

-The Transition from a very well-watered wet Sahara that completely vegetated to one that was much much dryer. That kinda transition in this core occurred within one or two centuries.

Scientists knew that the Sahara was in ever changing environment. Now for the first time, they have a sense of just how fast it changed. As the earth wobble shifted the rain belt away, the return to desert was swift and deadly.

-These transitions would’ve happened almost on the generational time scale that one generation after next after next would realize that where they’re living is no longer sustainable.

High above the ruins of the lake settlement, Fekri Hassan has discovered a cave. He believes was important to the Saharan people during this sudden change in climate. Perhaps it holds ‘I witness clues to what happened.’

-When I first came into the cave, the sand was as high as this level, and I had to crawl in because the sand had covered the whole area.

-Well, this windblown sand can not form when the desert is green.

Buried in the sand was the first clue, some perfectly preserved animal droppings.
实现无障碍英语沟通
HW
The question now for scientists was how quickly the Sahara change from bountiful back to bone dry.
Earlier, deep sea cores have provided evidence of the moment the Sahara first turn to desert three million years ago. And of how since then. A wobble in the earth's axis has made it swing like a pendulum between desert and grassland.
Now climate researcher Peter deMenocal on the haunt for the Sahara's last switch from green to desert. One that occurred in the last ten thousand years. To a geologist, opening this core is like a portal back in time.
Wow, that's amazing. It's much much redder in the upper part of the core.
Lay down flat, every quarter inch sediment of core represents 200 years. The color difference in the sediment is subtle. But to a practiced eye, it's a big clue.
When you split this core, what is surprising about it is that we see this really impressive color change in just, it goes from dark green, brown color in this section of the core which comes from the clay minerals that make up the deep sea sediments. This bright red sediment actually comes from wind blown dust that coming up of Sahara's desert. As you move around this core, you can see the color maintained itself, further upper and upper in the core, so right now about 7,000 years ago, boom, here is the drying of Sahara. You can put your finger on it, in this core right 55,000 years ago.
Crucially the proximity of these two layers reveals how quickly this switch happened.
The transition from a very well water wets Sahara completely vegetated to one that is much much drier. That climate transition in this core occurred within one or two centuries.
Scientists knew that the Sahara was a ever changing environment. Now for the first time, they have a sense of how fast it changed. As the earth wobble shift the rain belts away, the return to desert was swift and deadly.
These transitions would happen almost under the generational time scale that one generation after next after next would realize where their living was no longer sustainable.
High above the ruins of the lake settlements, F Hassan has discovered a cave. He believes was importance for the Saharan people during this sudden change in climate. Perhaps it holds eye-witness clues to what happened.
When I first came into the cave, the sand was as high as this level. And I had to crawl in because the sand had covered the whole area. Well this wind blown sand can not form when the desert is green.
Buried in the sand was the first clue, some perfectly preserved animal droppings.
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Hw, 2010-02-26 地球的起源 EarthMade—12

The question now for scientists was how quickly the Sahara changed from bountiful back to burn dry.
Earlier deep sea coals have provided evidence of the moment of the Sahara first turned to desert 3 million years ago.
And of how, since then, a workboat in these years’ sasses had made it swing like a pendulum between desert and grass land.
Now climate researcher Peter did many counts on the hunt for the Sahara’s last switch from green to desert. One that occurred in the last 10 thousand years.
Two geologists opening this coal is like a poldter back in time.
‘Wow, that’s amazing. It’s Much much ratter in the upper part of the coal.
Lay down flat, every quarter inch of settlement in this coal represents 200 years.
The color difference in this sediment is scuttled. That to a pretty sign is big clue.
When you flitted this coal what is surprising about it is that we see this, really impressive, color change. It just. It goes from sort of darker green, brown color, in this section of the coal which comes from the claiming orals that make up the deep sea sediments. This break red sediment actuarially comes from the windblown down dust coming after the hailing desert. As it moved along this court, you can see the color maintained itself. For the upper upper of the coal. So right now it is about 7 thousand years ago. Boom! Here is the drying of the Sahara. You can put your finger on it. In this coal right here. Five and a half thousand years ago.
Crucially, the proximity of these two layers reviews how quickly this switch happened
The transition from a very well water wet’s Sahara that was completely vegetated to one that much much drier. That climate transition in this coal occurred within 1 or 2 centers.
Scientists knew that the Sahara was in ever-changing environment. Now, for the first time, they have a sense of just how fast it changed.
As the earth workboat shifted, the rain belt away. The return to desert was swift and deadly.
These transitions would have happened almost on a generational time’s scale that one generation after next after next, would they realize that where they was living was no longer sustainable.
High above the Ruens of the lake sediment, Fakery Hason has discovered a cave. He believed it was important to the Saharan people during this sudden change and climate. Perhaps it holds eye-witness clues to what happened.
When I fist, ur, came into the cave, the sand was as high as this level. And I had to crawl in, because the sand had covered the whole area. Well, this windblown sand cannot form when the desert is green.
Berry in the sand was the first clue. Some perfectly preserved, animal droppings.
Go on
on nobody

The question now for scientists was how quickly the Sahara changed from bountiful back to bone dry.

Earlier, deep-sea cores had provided evidence of the moment the Sahara first turned to desert 3 million years ago, and of how since then, a wobble in the earth's axis has made it swing like a pendulum between desert and grassland.

Now climate researcher Peter Demenocal is on the hunt for the Sahara's last switch from green to desert, one that occurred in the last 10,000 years. To a geologist, opening this core is like a portal back in time.

-Wow, that's amazing. It's much, much redder in the upper part of the core.

Laid down flat, every quarter-inch of sediment in the core represents 200 years. The color difference in the sediment is subtle, but to a practiced eye, it's a big clue.

-When we split this core, what is surprising about it is that we see this really impressive color change, and it just, it goes from this sort of darker green-brown color in this section of the core, which comes from the clay minerals that make up the deep sea sediments. This bright red sediment actually comes from the windblown dust that's coming off the Saharan desert. As you move along this core, you can see this color maintains itself further up and up into the core. So, right now we are about 7,000 or 8,000 years ago. Boom, here is the drying of the Sahara. You can put your fingers on it, in this core right here, 5,500 years ago.

Crucially, the proximity of these two layers reveals how quickly the switch happened.

-The transition from a very well watered, wet Sahara that was completely vegetated to one that was much much dryer, that climate transition in this core occurred within one or two centuries.

Scientists knew that the Sahara was an ever changing environment. Now for the first time, they have a sense of just how fast it changed.
As the earth wobble shifted, the rain belt away, the return to desert was swift and deadly.

-These transitions would have happened almost on a generational time scale that one generation after the next after the next would have realized that where they’re living is no longer sustainable.

High above the ruins of the lake settlement, Fekri Hassan has discovered a cave he believes was important to the Saharan people during this sudden change in climate. Perhaps it holds eyewitness clues to what happened.

-When I first came into the cave, the sand was as high as this level and I had to crawl in because the sand had covered the whole area. Well, this windblown sand cannot form when the desert is green.

Buried in the sand was the first clue, some perfectly preserved animal droppings.

[Homework]2010-02-26 地球的起源 EarthMade—12

the questions now for scientists was how quickly the sahara changed from  banter of whole to burn dry.earlier, deep sea cores ,have provided evidence of the moment sahara first turned into desert 3 million years ago,and of how,since then,a wabal in the year sexis,it has made a swing like a pendulum,between desert and grassland.now climate reseachers peter demands calls on the hunt for the sahara's last switch,from green to desert.when it occured in the last ten thousand years.to a geologist,opening this core is like a potter back in time.
wow,that's amazing,too much much ritter in the part of the core,lay down flat,every  quater inter of settlement in the core represents 2000 years.the color difference in the settlement is shutted,but to approximate dye,is a big clue.when it's put in the core,what is surprising about it,is that we see is really impressive color change ,and it just,it grows from this of darker green,brown color,and this section of the core,which comes from the clay mineral,that make up the deep sea settlements.bright red settlements actually comes from the wind blown dusties in the saharan desert.as you move around this core,you can see that it's color maintain itself ,forther uper and uper to the core,so right now there are about 7 thousand of years ago ,booms and here is the driven of the sahala,put your finger on it,it's core right here 5000 years ago.
crucially,the proximity of this two layers views how quickly this switch happened.the transition from a very well water wet sahara that was completely vegetated to when that was much much drier.that climate transition in this core occured of in 1 or 2 centries.scientists knew that sahara wasn't ever changing in climate,just now ,for the first time,they have sensed of just how fast it changed.as the earth wabble shaped the sand walk away the return to desert was swift and desert.
this transitions would have happened in ancient time scheles ,that one generation after next ,untill they realise that where they are living is no longer sustainable,high about the ruins of the lake settlement,facrate haydson has  discoveried a cave ,he believed was important to the sahara people during this sudden change in climate.perhaps it holds i witnessclues to what happened,when i first came into the cave,it was as high as this level ,and i have to crode in,because the sun covered the whole area,while this wind blow the sun ,can not form when the desert is green,there are in the sun was the first clue,some personal preserved animal droppings

This post was generated by put listening repetition system,  Check the original dictation thread!
实现无障碍英语沟通

[Homework]【整理】2010-02-26 地球的起源 EarthMade—12

The question now for scientists was how quickly the Sahara changed from bountiful back to bone dry. Earlier deep sea cores had provided evidence of the moment the Sahara 1st turned to desert 3 million years ago and of how since then a wobble in the earth's axis has made it swing like a pendulum between desert and grassland. Now climate researcher Peter Demenocal is on the hunt for the Sahara's last switch from green to desert one that occured in the last 10,000 years. To a geologist, opening this core is like a portal back in time.

Wow that's amazing, much redder in the upper part of the core.

Laid down flat every quarter-inch of sediment in the core represents 200 years. The color difference in the sediment is subtle, but to a practiced eye it's a big clue.

When we split this core what is surprising about it is that we see this really impressive color change that just goes from this darker green-brown color in this section of the core which comes from the clay minerals that make up the deep sea sediments. This bright red sediment actually comes from the wind-blown dust that's coming off the Saharan desert. As you move along this core you can see this color maintains itself further up and up into the core so right now we're about seven or eight thousand years ago, boom here's the drying of the Sahara, you can put your fingers on it in this core right here 5,500 years ago.

Crucially the proximity of these 2 layers reveals how quickly the switch happened.

The transition from a well-watered, wet Sahara that was completely vegetated to one that was much much drier, that climate transition in this core occured within 1 or 2 centuries.

Scientists knew that the Sahara was an ever changing environment, now for the 1st time they have a sense of just how fast it changed. As the earth wobble shifted the rain belt away, the return to desert was swift and deadly.

These transitions would have happened almost on a generational time scale that 1 generation after next after next would have realized that where they're living is no longer sustainable.

High above the ruins of the lake settlement, Fekri Hassan has discovered a cave he believes was important to the Saharan people during the sudden change in climate. Perhaps it holds eyewitness clues to what happened.

When I 1st came into the cave the sand was as high as this level and I had to crawl in because the sand had covered the whole area. Well this wind-blown sand cannot form when the desert is green.

Buried in the sand was the 1st clue, some perfectly preserved animal droppings.

This post was generated by put listening repetition system,  Check the original dictation thread!
普特听力大课堂
HOMEWORK

The question now for scientists was how quickly the Sahara changed from bountiful back to bone dry. Earlier deep sea cores have provided evidence of the moment the Sahara first turned to desert 3 million years ago, and of how since then a wobble in the earth’s axis has made it swing like a pendulum between desert and grassland. Now climate researcher Peter deMenocal is on the hunt for the Sahara’s last switch from green to desert, one that occurred in the last 10,000 years. To a geologist, opening this core is like a portal back in time.

“Wow, that’s amazing. It’s much, much redder in the upper part of the core.”

Laid down flat, every quarter-inch of sediment in the core represents 200 years. The color difference in the sediment is subtle, but to a practiced eye, it’s a big clue.

“When we split this core, what is surprising about it is that we see this really impressive color change, and it just, it goes from this sort of darker green-brown color in this section of the core which comes from the clay minerals that make up the deep sea sediments. This bright red sediment actually comes from the windblown dust that’s coming off the Sahara desert. As you move along this core, you can see this color maintain itself, further up and up into the core. So right now we are about seven or eight thousand years ago. Boom, here is the drying of the Sahara. You can put your finger on it, in this core right here, 5,500 years ago.”

Crucially the proximity of these two layers reveals how quickly the switch happened.

“The transition from a very well watered wet Sahara that was completely vegetated to one that was much, much dryer, that kind of transition in this core occurred within one or two centuries.”

Scientists knew that the Sahara was an ever changing environment. Now for the first time, they have a sense of just how fast it changed. As the earth wobble shifted the rain belt away, the return to desert was swift and deadly.

“These transitions would have happened almost on a generational time scale that one generation after the next, after the next would have realized that where they are living is no longer sustainable.”

High above the ruins of the lake settlement, Fekri Hassan has discovered a cave he believes was important to the Sahara people during this sudden change in climate. Perhaps it holds eye-witnessed clues to what happened.

“When I first came into the cave, the sand was as high as this level, and I had to crawl in because the sand had covered the whole area. Well, this windblown sand cannot form when the desert is green.”

Buried in the sand was the first clue -- some perfectly preserved animal droppings.
好栏目推荐之美国口语俚语
The question now for scientists was how quickly the Sahara change from bountiful back to bone dry.
Early deep sea cores have provided evidence of the moment the Sahara first turned to desert three million years ago and how since then a wobble in the earth’s axis has made it swing like a pendulum between desert and grassland. Now climate researcher Peter D on the hunt for the Sahara’s last switch from green to the desert, one that occurred in the last 10,000 years, to a geologist opening this core is like a portal back in time.
Wow, that’s amazing, it’s much, much redder in upper part of the core.
Laid down flat, every quarter-inch of sediment in the core represents 200 years, the color difference in the sediment is subtle, but to a practiced eye, it’s a big clue.
When you spit this core what is supervising is that we see this, in really impressive color change, and it just they go some through dark, green, brown color, and this section of the core which comes from clay minerals that make up the deepest sediments, this brown red sediment actually come from the wind blow dust that’s coming after the Sahara desert, as you move along this core, you can see this color maintain itself, further up-up in the core, so right now we about 7 or 8,000 years ago, boom, here is the dry of the Sahara, you can put you figure on it, and this core right here 55.00 years ago.
Crucially the proximity of these two layers reveals how quickly the switch happened.
The transition from a very well water wet Sahara that was completed vegetated to one that was much, much dryer, that climate transition in this core occurred within one or two centuries.
Scientists knew that the Sahara was an ever change environment, but now for the first time they have sense of just how fast it changed.
As the earth’s wobbles shifted rain belt away, the returned to desert was swift and deadly.
This transition would have happened almost on a generational time scale that one generation after next after the next would have realized where they’re living is no longer sustainable.
High above the ruins of the lake settlement, F H has discovered a cave, he believes was important to the Sahara people during sudden change in climate, perhaps it holds eye-witness clues to what happened.
When I first came into the cave, the sand was as high as this level and I had crawled in because the sand not cover the whole area. Well this wind blown sand can not form when the desert is green.
Bury in the sand was the first clue, some perfect preserved animal droppings.
the question now for scientists was how quickly the sahara changed from bountful back
to bone dry.

earlier, deep sea cores had provided evidence of the moment the sahara first turned
to desert 3 million years ago, and how since then, a wobble in the earth's axis
has made it swing like a pendulum between desert and grass-land,

now client researcher Peter Demenocal is on the hunt for the sahara's last switch
from green to desert, one that occurred in the last 10,000 years, to a geologist,
openning this core is like a portal back in time,

"woo, that's amazing, it's much much redder in the upper part of the core"

laid down flat, every quarter-inch of sediment in the core represents two handred
years, the color difference in the sediment is subtle, but to a practiced eye, it's
a big clue,

when i splitted this core, what is surprising about it is that we see this in
really impressive color change, it just, it goes from this sort of dark green,
brown color, and this secion of core, which comes from the clay minerals that
make up the deep sea sediment, this bright red sediment actually comes from the
wind blowed dust that comes off from the sahara desert, as you move along this
core, you can this color maintaned itself further up and up in the core, so righ
now we are about 7 or 8 thousand ago, boom, here is drying of the sahara, you can
put your finger on it, and this core right here 5500 years ago.

crucially the proximaty of these two layers reveal how quickly this switch happened,

"transition from a very well watered wet sahara that was completely vegetated to one
now much much dryer, that climate transition in this core occured in one or two
centries "

scientists knew that the sahara was an ever changing environment, now for the first
time, they had a sense of just how fast it changed, as the earth's wobble shift the
rain belt away, the return to desert was swift and deadly.

this transition would've happened on almost a genrational time scale that one
generation after the next after the next whould have realized where they are living
is no longer sustainable.

higher above the ruin of the lake settlements, Fekri Hassan has discovered a cave,
he believed it was important to the sahara people during the sudden change in
climate,  perphaps it holds eye witness clue to what happened,

when i first came into this cave, the sand was as high as this level, and i had to
crawl in because the sand had covered the hole area.

well, this windblown sand can't form when the desert is green,

buried in the sand was the first clue, some perfectly preserved animal droppings
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