The oceanic crust is made of mafic rock called ________ and is about ________ thick on average.
A)basalt, 7 km
B)marine sedimentary rocks, 25 km
C)basalt, 70 km
D)granite, 35-40 km

Question

Quizplus · Accepted Answer

The oceanic crust is made of mafic rock called basalt and is about 7 km thick on average. The other options are incorrect, as marine sedimentary rocks are not the main component of the oceanic crust, granite is not mafic rock, and a thickness of 70 km is too thick for the oceanic crust.

The Oceanic Crust Is Made of Mafic Rock Called ________