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Why is the oceanic crust a consistently dark color while rock of the continental crust comes in a variety of colors?
a. Oceanic rock is denser than continental rock.
b. oceanic rock contains less oxygen than continental rock.
c. Oceanic rock is ultramafic rock erupted at fissures in the ocean bottom while there are many varieties of continental rock.
d. There is no light at the ocean bottom but sunlight illuminates the continents.
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