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Why did post-drift studies not consider the old jigsaw-fit evidence sufficient by itself?

Answer and explanation

Correct answer: Because shape matching does not explain the cause and process of movement

The jigsaw fit of continents was an important observation in support of continental drift, because some continental margins appear to fit together. However, a matching outline is only evidence that the landmasses may once have been joined. By itself, it does not explain what force moved the continents, how they moved, or what process could separate and carry them over long periods. Later studies therefore required additional evidence and a mechanism.

Option A is correct because it clearly distinguishes an observation from an explanation of movement. The margins do not have to match perfectly for the fit to be useful, so option B is too absolute. Options C and D are unrelated to geological reasoning. This distinction is important: evidence can suggest that an event happened, while a theory or mechanism must explain how and why it happened.

Related tags

Jigsaw FitEvidenceMechanism

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