Question

Why does a continental crust rise above an oceanic crust when the two meet?


A They are of equal density but the continental crust moves faster.


B It is less dense.


C They are of equal density but the continental crust moves slower.


D It is denser.

Answer 1

B

The reason the reason the oceanic plate is denser than the continental plate is because the former is percolated with water from the oceans hence adding to its density.

Explanation:

When they collide the oceanic plate is usually subducted by the continental plate. When the oceanic plate begins to melt, as it is subducted, the percolated water also turns to high-pressure steam adding to the pressure of the rising magma along the fissures created by stress along the convergent boundary. This is why most volcanoes along the convergent boundary are explosive.

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