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3 September, 22:57

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

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Answers (2)
  1. 4 September, 00:35
    0
    It might be obsidian.
  2. 4 September, 01:45
    0
    I think it is physician because I read it in a book
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