A volcanologist extracts a piece of rock near a volcano site and observes no visible crystals. After studying the rock for a while, he assumes it is obsidian. Why does he do so?

A) Obsidian is always hot.
B) Obsidian forms underground.
C) Obsidian is green.
D) Obsidian forms in lava flows.


Answer: D

Environmental & Atmospheric Sciences

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