Plutonic rocks are typically fine grained owing to a faster rate of cooling than volcanic rocks.

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Plutonic rocks are formed from magma that cools slowly beneath the Earth's surface, allowing for the growth of large crystals. Because of the slow cooling process, plutonic rocks are typically coarse-grained, not fine-grained. Volcanic rocks, on the other hand, cool quickly on or near the Earth's surface and are typically fine-grained.

Plutonic Rocks Are Typically Fine Grained Owing to a Faster