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Earth's surface consists of rigid plates that are

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Earth's surface consists of rigid plates that are [#permalink] New post 10 Feb 2005, 17:06
Earth’s surface consists of rigid plates that are constantly shifting and
jostling one another. Plate movements are the surface expressions of motions in the mantle—the thick shell of rock that lies between Earth’s crust and its metallic core. Although the hot rock of the mantle is a solid, under the tremendous pressure of the crust and overlying rock of the mantle, it flows like a viscous liquid. The mantle’s motions, analogous to those in a pot of boiling water, cool the mantle by carrying hot material to the surface and returning cooler material to the depths. When the edge of one plate bends under another and its cooler material is consumed in the mantle, volcanic activity occurs as molten lava rises from the downgoing plate and erupts through the overlying one.
Most volcanoes occur at plate boundaries. However, certain “misplacedâ€
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 [#permalink] New post 10 Feb 2005, 19:32
DBBA ?
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 [#permalink] New post 10 Feb 2005, 20:25
DBEE

The third one is a little tricky, B seems quite close but I think E is better.
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 [#permalink] New post 11 Feb 2005, 10:56
HongHu wrote:
DBEE

The third one is a little tricky, B seems quite close but I think E is better.


Agree with the first three.

why it's E not A for the last question?
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 [#permalink] New post 11 Feb 2005, 14:29
Quote:
The surface mark of an established plume is a hot spot.


Established plume means it's not "untapped" any more, I think.
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 [#permalink] New post 11 Feb 2005, 14:43
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For the 3rd, nothing in the passage suggests that the track of the plume was used to identify that the plates actually moved.

I thought that the second question with its reference to 'over a period of time' and then 'age' in the correct answer choice was a bit trickier than the rest.
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 [#permalink] New post 13 Feb 2005, 03:05
Hello, the OA is D,B,E,E

In the second question, why not A?

How to infer ?
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 [#permalink] New post 15 Feb 2005, 01:04
chunjuwu wrote:
Hello, the OA is D,B,E,E

In the second question, why not A?

How to infer ?


could anybody tell me, please. :oops:
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 [#permalink] New post 15 Feb 2005, 07:28
chunjuwu wrote:
chunjuwu wrote:
Hello, the OA is D,B,E,E

In the second question, why not A?

How to infer ?


could anybody tell me, please. :oops:


chunjuwu,
I am by no means an authority is RC, but here is my 2 cents.
only reference to Hawaiian islands we have in the passage is
"The natural history of the Hawaiian island chain clearly shows the movement of the Pacific plate over a fixed plume".

in other words, the Author is using Hawaiian islands to explain a particular phenomenon. No where he mentions that this type of activity doesn't occur else where in the world. Hence choice A is wrong

Hope this helps
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 [#permalink] New post 15 Feb 2005, 10:54
chunjuwu I got your message, here is what I feel about Q 23

Q23 states
It can be inferred from the passage that a chain of volcanoes created by a mantle plume would most likely be characterized by

A. a curved outline
B. constituent volcanoes that differ from each other in age


A is indeed very tempting. But it is out of context. Passage says

"Because the source of a hot spot remains fixed while a surface plate moves over it, over a long period of time an active plume creates a chain of volcanoes or volcanic islands, a track marking the position of the plume relative to the moving plate."
earlier in the passage it also states

"When the edge of one plate bends under another and its cooler material is consumed in the mantle, volcanic activity occurs as molten lava rises from the downgoing plate and erupts through the overlying one."


that means here emphasis is on the fact that hot spot remains fixed and plates move over it. When the hot spot hits the edges of the plates lava comes out. That means there is a time gap in between volcanos. Hence choice B

Even though the passage states "a track marking the position of the plume relative to the moving plate" it doesn't necessarily mean it is a curved outline because we don't really know how the plates move.
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 [#permalink] New post 15 Feb 2005, 14:40
I think the first questions answer is D
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 [#permalink] New post 15 Feb 2005, 14:50
Second one is B
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 [#permalink] New post 15 Feb 2005, 14:51
Thirs is E
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 [#permalink] New post 15 Feb 2005, 14:52
Fourth is E too

Man this was a tough one...took me 15 minutes to figure out

Whts the OA
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 [#permalink] New post 22 Feb 2005, 19:31
chunjuwu wrote:
chunjuwu wrote:
Hello, the OA is D,B,E,E

In the second question, why not A?

How to infer ?


could anybody tell me, please. :oops:


A is irrelevant
You know that it's B because of this part "the source of a hot spot remains fixed while a surface plate moves over it, over a long period of time an active plume creates a chain of volcanoes "
  [#permalink] 22 Feb 2005, 19:31
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