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7 September, 05:02

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. 7 September, 07:00
    0
    I think it is physician because I read it in a book
  2. 7 September, 09:02
    0
    It might be obsidian.
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