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Why is Arthur Holmes's idea considered complementary to Wegener's theory?

Answer and explanation

Correct answer: Because it added a possible explanation of force for movement

The direct answer is A: Holmes added a possible force or mechanism that could explain continental movement. Wegener presented evidence that continents had once been joined and later drifted, but his original explanation of the driving force was not convincing enough. Arthur Holmes proposed that convection currents inside the mantle could help move the crustal plates. Step by step: Wegener supplied the movement idea and supporting evidence; a theory also needs a mechanism; Holmes suggested heat-driven convection as a possible mechanism; this made his idea complementary to Wegener’s, not a denial of it. Option A is correct. B is wrong because Holmes did not say all continents were permanently fixed. C is wrong because later explanations did not deny fossil evidence. D is wrong because oceans were not removed from the theory. Memory cue: Wegener explained what happened; Holmes helped explain how movement might happen.

Related tags

Arthur HolmesWegenerComplementary Theory

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