How are igneous rocks formed? A. Lava or magma heats up and crystallizes. B. Hail falls and melts. C. Glaciers melt. D. Lava or magma cools and then crystallizes.

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asked Sep 16, 2016 198k views

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How are igneous rocks formed?

A. Lava or magma heats up and crystallizes.
B. Hail falls and melts.
C. Glaciers melt.
D. Lava or magma cools and then crystallizes.

Social Studies
high-school

Cdalitz asked

by Cdalitz

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1 Answer

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its D.obsidian is a rock that is cooled from lava to form a hard,black glass that was made into spear tips.

Oink answered Sep 20, 2016

by Oink

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