Discussion
The mean thickness of oceanic crust and continental crust is around:
Answer: C
The figures are about 5 km and 30 km.
Oceanic crust is thin and basaltic, formed continuously at mid-ocean ridges and destroyed at trenches, so none of it is older than about 200 million years. Continental crust is thick, granitic and much lighter, which is why it stands high and is not subducted - and why parts of it are 4,000 million years old.
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