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What determines whether an igneous rock will have large crystals or small crystals?

User PhillFox
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Answer:

Igneous rocks contain randomly arranged interlocking crystals.

Step-by-step explanation:

The size of the crystals depends on how quickly the molten magma solidified:

magma that cools slowly will form an igneous rock with large crystals

lava that cools quickly will form an igneous rock with small crystals

User Lependu
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