The ocean floor is younger than the rocks on the continents.

Name: The ocean floor is younger than the rocks on the continents.
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This is due to the process of plate tectonics. The ocean floor is constantly being formed at mid-ocean ridges and spreading outwards, while older oceanic crust is being subducted (pushed back down) into the mantle at ocean trenches. The continental crust, on the other hand, is much older and has undergone several cycles of formation and destruction over billions of years.

The Ocean Floor Is Younger Than the Rocks on the Continents