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16 August, 23:26

Which of these rocks forms from lava that cools very quickly?

A) schist

B) gneiss

C) granite

D) obsidian

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Answers (2)
  1. 16 August, 23:33
    0
    I am thinking the rock that forms from lava that cools quickly is D) Obsidian.
  2. 16 August, 23:36
    0
    D: Obsidian.

    It is a type of glass that is made from lava cooling very quickly. unlike the obsidian granite cools slowly to form a light-coloured rock while the obsidian formes a black coloured glass type rock.
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