What happens when a continental crust collides with oceanic crust?

Subduction occurs on continental boundaries because oceanic sub floor is denser and heavier than the lighter more buoyant crust. The oceanic crust slides under the continental crust areas usually on a plate boundary. This is in a recycle style mode that constantly is remaking the ocean floor.

The oldest rocks on the ocean bottom are a drop in the geologic time bucket, compared to the rock ages on land.

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