s9pad5ialmarijene s9pad5ialmarijene

09-12-2015
Social Studies

contestada

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.

Respuesta :

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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