______ igneous rocks, like gabbro and basalt, are silica-deficient with high magnesium and iron.
A) Felsic/silicic
B) Intermediate
C) Mafic
D) Intrusive
E) Extrusive

Question

Quizplus · Accepted Answer

Mafic igneous rocks have low silica content and high levels of magnesium and iron. Gabbro and basalt are examples of mafic rocks. Felsic/silicic igneous rocks, on the other hand, have high silica content and low levels of magnesium and iron. Intermediate rocks have a composition that falls between mafic and felsic/silicic rocks. Intrusive rocks have formed from magma that cools and solidifies below the Earth's surface, while extrusive rocks have formed from lava that has solidified on the Earth's surface. However, these terms do not describe the composition of the rock.

______ Igneous Rocks, Like Gabbro and Basalt, Are Silica-Deficient with High