Plutonic rocks are usually medium- or coarse-grained, whereas volcanic rocks are fine-grained.

Name: Plutonic rocks are usually medium- or coarse-grained, whereas volcanic rocks are fine-grained.
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This statement is generally true. Plutonic rocks cool and solidify slowly beneath the Earth's surface, allowing time for larger mineral crystals to form. Volcanic rocks, on the other hand, cool and solidify quickly on the Earth's surface or near it, resulting in smaller mineral crystals.

Plutonic Rocks Are Usually Medium- or Coarse-Grained, Whereas Volcanic Rocks