The physical characteristic that is used to distinguish intrusive igneous rocks from extrusive igneous rocks is _____________.

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Intrusive igneous rocks cool slowly beneath the Earth's surface, allowing crystals time to grow larger, resulting in a coarse-grained texture. Extrusive igneous rocks cool quickly on the surface, leading to a fine-grained or glassy texture. Grain size is the key physical characteristic used to distinguish between these two types of rocks.

The Physical Characteristic That Is Used to Distinguish Intrusive Igneous