Discussion
The average density of the outer-most layer (zone)- that is crust- of the earth is:
Answer: D
The crust averages a density of 2.8 to 3.0.
Continental crust is granitic and slightly lighter, around 2.7, while oceanic crust is basaltic and denser, about 3.0. Both are far lighter than the mantle below, at about 4.5, which is why the crust floats on it.
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