Which answer explains why plate B is moving underneath plate A A. Plate B is more dense than plate A because it is composed of oceanic crust

B. Plate A is more dense than plate B because it is composed of oceanic crust

C. plate B is more dense than plate A because it is composed of continental crust

D. Plate A is more dense than plate B because it is composed of continental crust

A.

Explanation:

Earth is composed of different layers and one layer moves over another due to differences in the densities.

According to the physics of density, a substance having less density floats over a higher density substance. The oceanic crust has more density than the continental crust that is why continental crust float over oceanic crust.

So in the given example, plate B is moving below the plate A, it means plate B is more dense than plate A because plate B is composed of oceanic crust . For example : continents float over the asthenosphere (a layer below the lithosphere).

Hence, the correct answer is "A ".

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