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

Question

Quizplus · Accepted Answer

Mafic rocks like basalt and gabbro are rich in magnesium and iron, making them denser and darker than felsic rocks. They are indeed the primary components of the ocean floor and many volcanic island chains, due to their formation from the partial melting of the Earth's mantle.

Mafic Rocks Like Basalt and Gabbro________