The most common extrusive rocks are generated from
A)andesitic magma.
B)granitic magma.
C)basaltic magma.
D)none of the above

Question

Quizplus · Accepted Answer

Basaltic magma is the most common type of magma that forms extrusive rocks. Basaltic magma has low viscosity, allowing it to flow easily and reach the surface where it solidifies quickly to form extrusive rocks such as basalt and andesite. Andesitic magma (A) and granitic magma (B) have higher viscosity and tend to form intrusive rocks instead.

The Most Common Extrusive Rocks Are Generated from