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Why is the mantle important in Convectional Current Theory?

Answer and explanation

Correct answer: Slow cyclic movement of hot and cool material is considered there

The direct answer is A. In Convectional Current Theory, the mantle is important because slow circulation of hot and cooler material is proposed within the mantle or the weak, partially mobile zone beneath the lithosphere. Heat from deeper Earth makes some material warmer and less dense, so it rises. Nearer the top it loses heat, becomes denser and sinks. This repeated movement is called convection and was proposed as a possible force related to plate movement. Option A correctly describes the process. Option B is wrong because the mantle is rocky material, not air. Option C is wrong because the mantle lies inside Earth, between the crust and core; it is not outside Earth. Option D is wrong because the mantle is not water, although it can deform very slowly. Memory cue: mantle, heat, rise, cool, sink.

Related tags

MantleConvection ZoneEarth Interior

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