llm123
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Obsidian's glassy texture indicates that it formed
a) slowly, deeply below earths surface
b) slowly, on earths surface
c) quickly, deep below earths surface
d) quickly, on earths surface

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meghansolo
Answer choice D. Obsidian forms quickly, on Earth's surface.
SenpaiTrill
Hello there.

Obsidian's glassy texture indicates that it formed 

d) quickly, on earths surface

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