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[探索发现] 【整理】2010-02-17 地球的起源 EarthMade—8

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[探索发现] 【整理】2010-02-17 地球的起源 EarthMade—8

本帖最后由 sylvia_qian 于 2010-2-19 10:51 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

 

-Ok, so, this is North Africa, here, and this is the edge of the Sahara Desert, so we’re here in Tunisia, with a, mega-lake here, and we know there is another, mega-lake here in southern Libya, and even larger one, here, in Chad.

 

-They all meet their maximum size, they would’ve cut 10% of the Sahara.

 

That would’ve made them three times larger than the Great Lakes. What is now the biggest desert on earth was once home to some of the planet’s largest bodies of fresh water.

 

Sudden changes in climate have been connected to everything, from volcanic activity to meteors hitting the earth. But climate researcher Peter deMenocal had a hunch this wasn’t the first time it had happened, he turned to his archive of deep ocean cores.

 

-Our approach was to use deep sea sediments as this continuous tape recorder, if you will, of past climate change in Africa.

 

By looking at the levels of desert dust in cores dating back hundreds of thousands of years, he discovered the Sahara had changed more than once.

 

-When we first collected these measurements, I really kind of almost fell back in my chair because what we saw was there are many switches like this in the climate system.

 

To explain these regular dramatic changes, deMenocal looked beyond the Sahara to the rotation of the earth itself. More specifically, small wobbles in the earth orbit around the sun. The theory is that the wobble causes the earth to tilt slightly. So the monsoons which drench southern Africa today shift up, pouring rain onto the dunes of the Sahara, crucially, theses wobbles occur every 20,000 years.

 

-So this is perfect one-to-one match between when Africa was wet and the stage of the wobble cycle. I mean this goes back millions of years.

 

Each time the rain belt moves up, the landscape is transformed and the desert turns green.

 

-To me the single most impressive thing about Sahara is how small fluctuations in something as simple as a wobble in the earth orbit can lead to these really, just totally dramatic changes in the climate of origin that so large.

 

Scientists now had evidence of how and why the Sahara turned green. They knew that giant lakes covered much of the desert, but they had no proof they were connected. Were these vast isolated rain pools or part of an interconnected river system, as suggested by NASA’s radar images?


 

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Homework

-Of a case, this is North Africa, here, and this is the edge of Sahara Desert, so we’re here in Guinea, with that, make a lie here, and we know there is Nava, make a lie here in southern Libya, and even a larger one, here, in Chad.
-They all make them maximum site, they would’ve cut 10% of Sahara.

That would’ve made themselves three times larger than the Great Lakes. What is now the biggest desert on earth was once home to some of the planet’s largest bodies of fresh water.

Sudden changes in climate have been connected to everything, from volcanic activity to medias hitting the earth. But climate researcher Peter deMenocol had a haunch this wasn’t the first time it had happened, he turned to his a** of deep ocean cores.

-Our approt was to use deep sea settlements as this continuous // fill well of pass changing in Africa.

By looking at the levels of desert dust in cores dating back hundreds of thousands of years, he discovered the Sahara had changed more than once.

-When we first collected these measurements, I really kinda almost fell back my chair because what we saw was there were many switches like this in the climate system.

To explain these regular dramatic changes, deMenocol look beyond the Sahara to the rotation of the earth itself. More specifically, small wobbles in the earth orven around the sun. The theory is that the wobble costs the earth to till slightly. So the monsoons which drained southern Sahara today shift up, pouring rain onto the dunes of Sahara, crucially, theses wo** occur every 20,000 years.

-So this is perfect wonder match between one Africa or // and the stage of the wobble cycle. You know this goes back millions of years.

Each time the rain belt moves up, the landscape is transformed and the desert turns green.

-It’s neither the single most impressive thing about Sahara is how small fucturations, something as simple as wobble in the earth orbit can lead to this really, just totally dramatic changes in the climate of origin that so large.

Scientists now had evidence of how and why the Sahara turned green. They knew that giant lakes covered much of the desert, but they had no proof they were connected. Were these vast isolated rain pools or part of an intro-connected river system has suggested by NASA’s radar images?
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HW

OK so, this is North Africa, here. And this is the edge of Sahara Desert. So we are here in Guinea with a make lake here and we know there's another make a lake here in Southern Libya. And even a larger one, here,  in C.

That would make them three times larger than the Great Lakes. What is now the biggest desert on earth is once home to some of the planet's largest bodies of fresh water.

Sudden changes in climate have been connected to everything from volcanic activity to meteor hitting the earth.

The climate researcher Peter deMenocol had a hunch: this was not the first time that it happened. He turned to his archive of deep ocean course.

Our pro was to use deep sea settlements as this continuous paper recorder * climate change in Africa.

By looking at the levels of desert dust in course dating back hundreds of thousands of years, he discovered Sahara had changed more than once.

When it first collected these measurements, I really kind of almost fell back in my chair because what we saw was there are many switches like this in the climate system.

To explain these regular dramatic changes, deMenocol looked beyond the Sahara to the rotation of the earth itself. More specifically, small wobbles in the earth orbit around the sun. The theory is that the wobble causes the earth to tilt slightly. So the monsoons which drench South Africa today shift up, pouring rain on the dunes of Sahara. Crucially, these wobbles occur every 20,000 years.

So this is perfect wonder why between one Africa was wet and the stage of wobble cycle when this goes back  millions of years.

Each time the rain belt moves up,  the landscape is transformed, and the desert turns green.

To me, the single most impressive thing about Sahara is how small fluctuations in something as simple as a wobble in the earth orbit can lead to these really, just totally dramatic changes in the climate of a region that's so large.

Scientists now had evidence of how and why the Sahara turned green. They knew the Giant Lakes covered much of the desert,  but they had no proof they were connected. Were these vast isolated rain pools or part of an intraconnected river system as suggested by NASA's radar images?
实现无障碍英语沟通
on fire


-Ok, so /, this is North Africa, here, and this is the edge of the Sahara Desert, so we’re here in Tunisia, with a, mega-lake here, and we know there is another, mega-lake here in southern Libya, and even / larger one, here, in Chad.

-They all meet their maximum size, they would’ve cut 10% of the Sahara.

That would’ve made them/ three times larger than the Great Lakes. What is now the biggest desert on earth was once home to some of the planet’s largest bodies of fresh water.

Sudden changes in climate have been connected to everything, from volcanic activity to meteors hitting the earth. But climate researcher Peter deMenocal had a hunch this wasn’t the first time it had happened, he turned to his archive of deep ocean cores.

-Our approach was to use deep sea sediments as this continuous tape recorder, if you will, of past climate change in Africa.

By looking at the levels of desert dust in cores dating back hundreds of thousands of years, he discovered the Sahara had changed more than once.

-When we first collected these measurements, I really kind of almost fell back in my chair because what we saw was there are many switches like this in the climate system.

To explain these regular dramatic changes, deMenocal looked beyond the Sahara to the rotation of the earth itself. More specifically, small wobbles in the earth orbit around the sun. The theory is that the wobble causes the earth to tilt slightly. So the monsoons which drench southern Sahara today shift up, pouring rain onto the dunes of the Sahara, crucially, theses wobbles occur every 20,000 years.

-So this is perfect one-to-one match between when Africa was wet and the stage of the wobble cycle. You know this goes back millions of years.

Each time the rain belt moves up, the landscape is transformed and the desert turns green.

-To me / the single most impressive thing about Sahara is how small fluctuations in something as simple as a wobble in the earth orbit can lead to these really, just totally dramatic changes in the climate of origin that so large.

Scientists now had evidence of how and why the Sahara turned green. They knew that giant lakes covered much of the desert, but they had no proof they were connected. Were these vast isolated rain pools or part of an interconnected river system, as suggested by NASA’s radar images?
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本帖最后由 sylvia_qian 于 2010-2-19 10:39 编辑

每次都直接用版主的整理稿,心里好过意不去哦。但自己又听写不出来,站在一边看你们听写,干着急。。。


----------------------------
不急不急哈,慢慢来,尝试着也提交作业哈
很快就会发现内容越来越容易听懂了哈
新年快乐---sylvia

[Homework]2010-02-17 地球的起源 EarthMade—8

Ok, so this is North Africa here. And this is the edge of the Sahara Desert. So we are here in Tunisia with the megalake here. And we know there is another megalake here in southern Libya and even larger one here in Chad. They all meet their maximum size. They would have covered 10% of the Sahara.
That would have made them 3 times larger than the Great Lakes. What is now the biggest desert on earth was once home to some of the planet's largest bodies of fresh water. Sudden changes in climate have been connected to everything from Volcanic activity to meteor hitting the earth. But climate researcher Peter deMenocol had a hunch this wasn't the first time it happened. He turned to his archives of deep ocean cores.
Our approach was to use deep sea sediments as this continuous tape recorder, if you will, of past climate change in Africa.
By looking at the levels of desert dust in coresdating back hundreds of thousands years, he discovered the Sahara had changed more than once.
When we first collected these measurements, I really kind of almost fell back in my chair because what we saw was there are many switches like this in the climate system.
To explain these regular dramatic changes, deMenocol looked beyond the Sahara to the rotation of the earth itself. More specifically, small wobbles in the earth orbit around the sun. The theory is that the wobble causes the earth to tilt slightly. So the monsoon which drench the Southen Africa today shifted up, pouring rain onto the dunes of the Sahara, these wobbles occur every 20,000 years.
So this is perfect one-to-one match between when Africa was wet and the stage of the wobble cycle. You know this goes back millions of years.
Each time the rain belt moves up, the landscape is transformed, and the desert turns green.
To me, the single most impressive thing about Sahara is how small fluctuation in something as simple as a wobble in the earth orbit, can lead to these really, just totally dramatic changes in the climate, a region that so large.
Scientists now had evidence of how and why the Sahara turned green. They knew the giant lakes covered much of the desert, but they had no proof they were connected. Were these vast isolated rain pools or part of an interconnected river system as suggested by NASA's radar images?

This post was generated by put listening repetition system,  Check the original dictation thread!
HOMEWORK

“Ok, so this is North Africa here, and this is the edge of Sahara Desert. So we are here in Tunisia with a mega lake here. And we know there is another mage lake here in southern Libya, and even a larger one here in Chad. They all meet their maximum size. They would have cut 10% of Sahara.”

That would have made them three times larger than the Great Lakes. What is now the biggest desert on earth was once home to some of the planet’s largest bodies of fresh water.

Sudden changes in climate have been connected to everything from volcanic activity to meteors hitting the earth. But climate researcher Peter deMenocal had a hunch this wasn’t the first time it had happened. He turned to his archive of deep ocean cores.

“Our approach was to use deep sea sediments as this continuous tape recorder, if you will, of past climate change in Africa.”

By looking at the levels of desert dust in cores dating back hundreds of thousands of years, he discovered the Sahara had changed more than once.

“When we first collected these measurements, I really kinda almost fell back in my chair because what we saw was there are many switches like this in the climate system.”

To explain these regular dramatic changes, deMenocal looked beyond the Sahara to the rotation of the earth itself. More specifically, small wobbles in the earth orbit around the sun. The theory is that the wobble causes the earth to tilt slightly, so the monsoons which drench southern Africa today shift up, pouring rain onto the dunes of the Sahara. Crucially, these wobbles occur every 20,000 years.

“So this is perfect one-to-one match between when Africa was wet and the stage of the wobble cycle. I mean this goes back millions of years.”

Each time the rain belt moves up, the landscape is transformed and the desert turns green.

“To me though the single most impressive thing about Sahara is how small fluctuations in something as simple as a wobble in the earth orbit can lead to these really, just totally dramatic changes in the climate of a region that’s so large.”

Scientists now had evidence of how and why the Sahara turned green. They knew that giant lakes covered much of the desert, but they had no proof they were connected. Were these vast isolated rain pools or part of an interconnected river system, as suggested by NASA’s radar images?
实现无障碍英语沟通
Ok,so this is northern African here, and this is the edge of the Sahara desert, so we are here in Tunisia, with a mega lake here, and we know there is another mega lake here in southern Libya, and even large one here in Chad. They all meet their maximum size, they would’ve cut ten percent of the Sahara.
That would’ve made them three times larger than the great lakes, what is now the biggest desert on the earth was once home to some planet’s largest bodies of fresh water.
Sudden changes in climate have been connected to everything, from volcanic activity to meteors hitting the earth, but climate research Peter deMenocal had a hunch this wasn’t the first time it had happened, he turned to his archive of deep ocean course.
Our approach was to use deep sea sediments as this continues tape records, if you will, of past climate change in Africa
By looking the levels of the desert dust in cores dating back hundreds of thousands of years, he discovered the Sahara had changed more than once.
When we first collected these measurements, I really kind of fell back my chair because what we saw was there are many switches like this in climate system.
To explain these regular dramatic changes, deMenocal looked beyond the Sahara to the rotation of the earth itself. More specifically small wobbles in the earth’s obit around the sun, the theory it is the wobble causes the earth tilt slightly, so the monsoons which drench southern Africa today shifted up pouring rain on to the dunes of the Sahara, crucially these wobbles incur every 20,000 years.
So this is perfect one to one match between one Africa was wet and the stage of wobble cycle, this goes back millions of years.
Each time the rain belt moves up, the landscape is transformed, and the desert turns green.
To me that the single most impressive things about the Sahara is how small fluctuations in something as simple as a wobble in the earth orbit, can lead this, really just totally dramatic changes in a climate of original that so large.
Scientists now had evidence of how and why the Sahara turned green, they knew that the giant lakes covered much of the desert, but they have no proof they were connected, where these vast isolated rain pools or part of an inter-connected river system as suggested by NASA’s radar images?
普特听力大课堂
ok, so this is north africa, here, and this is the edge of the sahara desert
so we are here in Tunisia, with maga lake here, and we know there is another,
mega lake, here in southern Libya, even a larger one, here, in Chad. they
all meet the maximum size, they would've cut 10% of the sahara.

that would've made them 3 times larger than the Great lakes, what's now the
biggest desert on earth was once home to some of planet's largest body of
fresh water.

sudden changes in climate have been connected to everything, from volcanic
activities to meteors hitting the earth, but climate resercher Peter deMenocal
had a hunch, this wasn't the first time it had happened, he turned to his
archives of deep ocean cores.

"our approach was to use deep sea sediments as this continous paper recorder
, if you will, the past climate change in africa"

by looking at the levels of the desert dust in cores dating back hundreds of
thousands of years, he just discovered that the sahara has changed more than
once,

"when we first collected these measurements, I really xxx almost back in
my chair becasue what we saw there are many switches like this in the climate
system"

to explain these regular dramtical changes, deMenocal looked beyond the sahara,
to the rotation of the earth itself, most specifically, small wobbles in the
earth orbit around the sun, the theory is that the wobble cause the earth to
tilt slightly, so the moon soon which drench the southern africa today shift
up, pouring rain onto the dunes of the sahara, crucially, these wobbles occur
every 20,000 years.

so this is the perfect one-to-one match between when africa was wet and the
stage of the wobble cycle. I means this goes back millions of years.

each time the rain belt moves up, the landscape is tranformed, and the desert
turns green.

to me the single most impressive thing about sahara is how small fluctuations
, something as simple as a wobble in the earth orbit, can lead this really
just totally dramtic changes in the climate of a region that so large

scientists now had evidence of how and why the sahara turned green, they
knew the giant lake covered much of desert, but they had no prove they were
connected, were these vast isolated rain pools or part of interconnected river
system as suggested by NASA radar system.
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