2008-5-11
, B5 o5 U O! J" R' P u oMINI练习5
答案:错三个(恶心死了)
听写部分:
The professor sure spent a lot of time on discussing news(those) huge earthquake near the
! u5 |. k) H1 T% S7 i# KMississippi
Yes(Yeah) , well, that's because they were such big earthquakes
The biggest known occurs(to have occurred) on North American continent
And when did it take place?
In the 18th century, I believe, is that what you heard?
No, they were in the early 1800s, in the winter of 1811 to 1812. There were big earthquakes in December, and(in) January, and then it gets(again) in February
So that will(would) be the early part of 19th century, then.
Exactly
Now there was something I didn't understand. Where did the earthquake take place? Was it in Mississippi or in Missouri, the professor mentioned both.
Oh, now that was more than a big(bit) confusion(confusing), the earthquakes (quakes) were centered in the state of Missouri and not Mississippi, but they were in Mississippi River valley in Missouri. That's why the professor mentioned both, Missisipy and Missouri.
Look, there is a map here in our text. You can see that the earthquakes were centered in New Madrid, Missouri, which is located the long side(alongside) of (the) ' _6 g5 d! q/ X; A& p: B( V6 o
Mississippi River. So the earthquakes were centered in the state of Missouri rather than the state of Mississippi, but they were along the Mississippi River.
And these circles make(indicate) how far away the earthquake could be felt?1 n" T$ E" g% f9 ]7 t, w! W
Yes these were supposedly probably the most powerful earthquakse ever recorded in North of America. They were so strong that they can(could) be felt all the way up to(the) East Coast.
The professor said they can(could) be felt over the(an) area of more than a million square miles.
And they were strong enough to cause
3 l( ]- X" R1 b3 [ B( @topigraphic(topographic) changes in area. Topographic changes? Those are changes and(in the) physical features ever(of a) region, aren’t they?
- M0 w- Y& b* t& |. R, e, C
Yes, they are. And the(these) earthquakes(quakes) had really unusual degree of% X w; V V2 S' M; q" j
from the graphical(effect on the topography of the area), didn’t they?
They did. Over 30000 square miles of land sank. in the area of sinking land, lakes were formed, including real footly, cantinent sea(Reelfoot Lake in Tennessee).! C/ m8 ]5 _' _
In other areas, the elevation of land increasing(increased) enough to make lakes there disappeared. Thousands of lakes(acres) of priory(prairie) were created, ( ?0 j( c& W8 p$ p% u( X
and thousands of craters of empty sands were formed .The earthquakes were so powerful that they even changed the cross(course) of Mississippi .
So those earthquakes had a huge fect(effect) on Topography in the area. They caused the land to rise and fall, lakes to form, and rivers to change its direction. That's incorretable(incredible).Now in addition to Topography, the professor also talked about the theory of plate Tatanis(tectonics). exactly what is the theory of plate tectonics?
According to the theory of plate tectonics , earthquakes can occur when the large plates that make up the cross(crust) of the earth move and push the(up) ganst(against) each other. Look, you can see the words image(world’s major) tectonics on this map.
How vally(valid) is the theory plate tectonics? Do earthquake always occur along the edges of plates?
Well, it explains about 95% of the earthquake inspite(that) occur in the world. However the remaining 5% of the earthquakes occur in the middle of the large plates, so the theory of plate tectonics doesn't explain them. These earthquakes are called interpolates(intraplate) earthquakes.
So they must because of(be caused in a) different way.
Was that why the professor was talking about the theory of plate tectonics and(in) relation to the Mississippi earthquakes? After all, Mississippi is far from the edge sof plates.
Yeah, most huge earthquakes occur when the plates meet, but the Mississippi earthquakes were huge earthquakes that occurred in the middle of the plates, so they are exception of(to) the theory that earthquakes occur when(where) just(giant) the plates meet.
Yeah, that's true. The Mississippi earthquakes are intraplate earthquakes.
They are part of the 5% of earthquakes that occur in the middle of plates and not part of the 95% of earthquakes that occur along the edges of the plates. These earthquakes, huge though they were, did not occur at the point where the huge plates crushing(came crashing) together.
This is all much clearer to me now; I'm really glad we got together and discussed a lot (all) of this.
You could(can) say that again.