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Artist 52 [7]
3 years ago
11

Which of these igneous rocks cooled so quickly that crystals

Biology
1 answer:
Ostrovityanka [42]3 years ago
7 0
Obsidian is produced when lava cools very quickly. The lava coo ls so quickly that no crystals can form. When people make glass they melt silica rocks like sand and quartz then cool it rapidly by placing it in water. Obsidian is produced in nature in a similar way.
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Sonbull [250]

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2 years ago
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