A classification scheme that grouped plutonic and metamorphic rocks together and sedimentary and volcanic rocks together would be based on
A) the average grain size of the rocks.
B) the presence of glass in the rocks.
C) the location of the rock's formation.
D) the bulk composition of the rocks.

Question

Quizplus · Accepted Answer

Plutonic and metamorphic rocks are both formed beneath the Earth's surface, while sedimentary and volcanic rocks are formed at or near the surface. This classification scheme is based on the location of the rock's formation.

A Classification Scheme That Grouped Plutonic and Metamorphic Rocks Together