Obsidian:
A) forms deep in the crust.
B) is a metamorphic rock.
C) forms from weathering of granite.
D) is volcanic glass.

Name: Obsidian: A) forms deep in the crust. B) is a metamorphic rock. C) forms from weathering of granite. D) is volcanic glass.
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Question

Quizplus · Accepted Answer

Obsidian is a volcanic glass that forms from the rapid cooling of lava, often in rhyolitic or dacitic compositions. It is not a rock that forms deep in the crust, nor is it a metamorphic rock or formed from the weathering of granite.