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# According to the theory of plate tecton- ics, the lithospher

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According to the theory of plate tecton- ics, the lithospher [#permalink]  28 Dec 2018, 08:32
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According to the theory of plate tectonics, the lithosphere (Earth’s relatively hard and solid outer layer consisting of the crust Line and part of the underlying mantle) is divided into a few dozen plates that vary in size and shape; in general, these plates move in relation to one another. They move away from one another at a mid-ocean ridge, a long chain of sub-oceanic mountains that forms a boundary between plates. At a mid-ocean ridge, new lithospheric material in the form of hot magma pushes up from the Earth’s interior. The injection of this new lithospheric material from below causes the phenomenon known as sea-floor spreading.

Given that the earth is not expanding in size to any appreciable degree, how can “new” lithosphere be created at a mid-ocean ridge? For new lithosphere to come into being in one region, an equal amount of lithospheric material must be destroyed somewhere else. This destruction takes place at a boundary between plates called a subduction zone. At a subduction zone, one plate is pushed down under another into the red-hot mantle, where over a span of millions of years it is absorbed into the mantle.
According to the passage, a mid-ocean ridge differs from a subduction zone in that

A. it marks the boundary line between neighboring plates
B. ​only the former is located on the ocean floor ​
C. it is a site for the emergence of new lithospheric material ​
D. the former periodically disrupts the earth’s geomagnetic field ​
E. it is involved with lithospheric destruction rather than lithospheric creation

[Reveal] Spoiler: OA
C

It can be inferred from the passage that as new lithospheric material is injected from below ​

A. the plates become immobilized in a kind of gridlock ​
B. it is incorporated into an underwater mountain ridge ​
C. the earth’s total mass is altered ​
D. it reverses its magnetic polarity
E: the immediately adjacent plates sink

[Reveal] Spoiler: OA
B

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Re: According to the theory of plate tecton- ics, the lithospher [#permalink]  16 Jan 2019, 21:01

+1 kudos to the posts containing answer explanations of all questions

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Re: According to the theory of plate tecton- ics, the lithospher [#permalink]  11 Jul 2019, 22:06
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According to the passage, a mid-ocean ridge differs from a subduction zone in that

A. it marks the boundary line between neighboring plates : Wrong, not mentioned in the passage.
B. ​only the former is located on the ocean floor ​:
C. it is a site for the emergence of new lithospheric material ​: correct, as mentioned "At a mid-ocean ridge, new lithospheric material in the form of hot magma pushes up from the Earth’s interior. The injection of this new lithospheric material from below causes the phenomenon known as sea-floor spreading."
D. the former periodically disrupts the earth’s geomagnetic field ​: Wrong, out of context.
E. it is involved with lithospheric destruction rather than lithospheric creation : Wrong, it is opposite.

It can be inferred from the passage that as new lithospheric material is injected from below ​

A. the plates become immobilized in a kind of gridlock ​: Wrong, out of context.
B. it is incorporated into an underwater mountain ridge ​: Correct. As mentioned " a long chain of sub-oceanic mountains "
C. the earth’s total mass is altered ​: Wrong, the question was raised but answered later in passage. "an equal amount of lithospheric material must be destroyed somewhere else. This destruction takes place at a boundary between plates called a subduction zone."
D. it reverses its magnetic polarity : Wrong, out of context.
E: the immediately adjacent plates sink : Wrong, out of context. in subduction zonne it may happen but not adjacent.
Re: According to the theory of plate tecton- ics, the lithospher   [#permalink] 11 Jul 2019, 22:06
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