DSST Introduction To Geology Practice Questions - Introduction To Geology Exam

Why do intrusive igneous rocks usually have larger crystals than extrusive igneous rocks?

They cool slowly below the surface, allowing crystals more time to grow They form only from sedimentary layers rich in fossils They are always melted by river water before solidifying They cool instantly in air, trapping crystals that already existed

Correct Answer:

They cool slowly below the surface, allowing crystals more time to grow

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