Mafic rocks like basalt and gabbro ________.
A)are major constituents of the continental crust
B)are very low in their iron and magnesium contents
C)form mainly in continental mountain belts
D)make up most of the ocean floor and volcanic island chains

Question

Quizplus · Accepted Answer

Mafic rocks like basalt and gabbro make up most of the ocean floor and volcanic island chains. They are not major constituents of the continental crust, are high in their iron and magnesium contents, and form mainly in a divergent plate boundary.

Mafic Rocks Like Basalt and Gabbro ________