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A volcano erupts which term best describes the rock that will eventually form on the surface
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A volcano erupts which term best describes the rock that will eventually form on the surface

User Olivier De Jonge
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When magma comes out of the volcano and cools down a smidge it becomes lava. And when the lava cools down all the way to a touchable temperature it will harden into obsidian.

Answer:
Obsidian.
User Ytsejam
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