Oceans are about four times as deep as mountains are high. At the bottom of the ocean are
A. thick oceanic crust at the ocean ridges that gradually thins as it nears the deep ocean trenches.
B. towering plutonic mountains created from volcanoes and fissure eruptions at the oceanic trench areas.
C. huge towering mountains, deep valleys, and deep ocean trenches near the continental borders.
D. all of the above
Answer: C
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