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According to current plate tectonics theory, Choose one: A. plates move around by convection on the uppermost part of the mantle. B. plates move at speeds of a few meters per year. C. a continental plate will subduct under an oceanic plate when the two converge. D. plates are composed of the crust and the uppermost part of the mantle.

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Answer:

D. Plates are composed of the crust and the uppermost part of the mantle.

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