The granitic igneous rocks that make up the Sierra Nevada Mountains in California and Nevada are ________.
A)extrusive
B)intrusive
C)metamorphic

Question

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The Sierra Nevada Mountains are composed of granitic igneous rocks, which are formed from magma that cools slowly beneath the earth's surface. This type of rock formation is known as intrusive, as opposed to extrusive rocks which are formed from magma that cools quickly on the earth's surface, or metamorphic rocks which are formed from the alteration of existing rocks due to heat, pressure, or chemical processes.

The Granitic Igneous Rocks That Make Up the Sierra Nevada