How can you tell apart volcanic and plutonic rocks?
A) Look at their fracturing properties.
B) Volcanic rocks are fine grained; plutonic rocks are coarse grained.
C) Volcanic rocks are colder than plutonic rocks.
D) Volcanic rocks are older than plutonic rocks.

Question

Quizplus · Accepted Answer

Volcanic rocks are formed by the rapid cooling of magma or lava on the Earth's surface, resulting in a fine-grained texture. Plutonic rocks, on the other hand, are formed by the slow cooling of magma deep within the Earth's crust, resulting in a coarse-grained texture. Therefore, one can differentiate between the two based on their grain size.

How Can You Tell Apart Volcanic and Plutonic Rocks