s9pad5ialmarijene s9pad5ialmarijene

09-12-2015
Social Studies

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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.

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joshrulez213 joshrulez213

09-12-2015

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

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