The continental crust is heterogeneous but is predominantly made of ________ and averages ________ thick.
A)basalt, 7 km
B)granite, 35 km
C)metasedimentary rocks, 600 km
D)granite, 3.5 km

Question

Quizplus · Accepted Answer

The continental crust is predominantly made up of granite and averages about 35 km in thickness. This is in contrast to the oceanic crust which is predominantly basalt and only averages about 7 km in thickness. Choice A is incorrect because basalt is predominant in oceanic crust, not continental. Choice C is incorrect because metasedimentary rocks make up a small portion of the continental crust, and certainly not anywhere near 600 km in thickness. Choice D is incorrect because while granite is the dominant rock type in continental crust, it is thicker than 3.5 km on average.

The Continental Crust Is Heterogeneous but Is Predominantly Made of ________