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24 July, 13:20

Describe how obsidian is created from a volcano.

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  1. 24 July, 16:48
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    Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth ... The inhibition of atomic diffusion through this highly viscous lava explains the lack of crystal growth.
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