Oceanic plates are ____.?

a. ?poor in basalt, but rich in silicates
b. ?an even mix of basalts and silicates
c. ?rich in basalt and silicates
d. ?rich in basalt, but poor in silicates
e. ?poor in basalts and silicates


ANSWER: d

Environmental & Atmospheric Sciences

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A) are isolated and have well-defined crescent shapes.
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