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How are igneous rocks formed?

a. lava or magma cools and then crystallizes.
b. sediments deposit in a lake and turn to stone.
c. heat and pressure from nearby magma changes existing rock.
d. lava or magma heats up and crystallizes.

User Bigfish
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1 Answer

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A. lava or magma cools and then crystallizes.
User Andrew Davey
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