What are the differences between oceanic and continental crust

Explanation:

Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust. ... Because continental crust is less dense than oceanic crust it floats higher on the mantle, just like a piece of Styrofoam floats higher on water than a piece of wood does.

The continental crust is by far the older of the two types of crust.

Hope this helps you out ; )

show the wavelengths of a wave. show the crests of a wave.

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c) both a and b.