Which was not initially an important form of evidence used in support of the theory of plate tectonics?

Name: Which was not initially an important form of evidence used in support of the theory of plate tectonics?
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Question

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The chemical composition of lava from volcanoes was not initially an important form of evidence used in support of the theory of plate tectonics. The other choices were all initial pieces of evidence used to support the theory.

Which Was Not Initially an Important Form of Evidence Used