Geologists distinguish between two main categories of igneous rock-extrusive and intrusive-based on
A) how fast the magma migrated.
B) whether or not the rock contains volatiles.
C) where the rock solidified.
D) if it has a high or low melting point.

Question

Quizplus · Accepted Answer

Geologists distinguish between two main categories of igneous rock-extrusive and intrusive-based on where the rock solidified. Extrusive igneous rocks solidify on or near the Earth's surface, while intrusive igneous rocks solidify below the surface. This is the major factor that differentiates the two categories. The other options are incorrect because melting point and volatiles do not inherently determine whether a rock is extrusive or intrusive, and the speed of magma migration is not directly related to the type of rock formed.

Geologists Distinguish Between Two Main Categories of Igneous Rock-Extrusive and Intrusive-Based