Johnny10
Johnny10 Johnny10
  • 27-10-2014
  • English
Answered

What black glassy mineral might you get if molten lava cooled so rapidly that crystals did not have time to form



Answer :

Malina Malina
  • 27-10-2014
It might be obsidian.
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ohernandez2621 ohernandez2621
  • 27-10-2014
I think it is physician because I read it in a book
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