What is the composition of Earth's crust?
A) oceanic: basalt and gabbro; continental: felsic and mafic rocks
B) oceanic: basalt; continental: felsic
C) oceanic: felsic and mafic rocks; continental: mafic rocks
D) oceanic: mafic rocks with some gabbro; continental: felsic rocks with some basalt
Answer: A
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