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How extrusive igneous rocks and intrusive igneous rocks form?
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How extrusive igneous rocks and intrusive igneous rocks form?

User Apapa
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Intrusive igneous rocks are formed when magma cools slowy and large crystals are formed

Extrusive igneous rocks are formed when magma cools quickly, and small or no crystals are formed, it may be vesicular meaning it may contains air bubbles.

User Newtonrd
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