How do crystals in extrusive rocks form?

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asked Jan 28, 2017 169k views

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Sebastian Graf · Answer 1 · 2017-01-31T20:59:18+0000

Extrusive Igneous Rocks Igneous rocks are called extrusive when they cool and solidify above the surface. Theses rocks usually form from a volcano,so they are also called volcanic rock

How do crystals in extrusive rocks form?

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