caronbanks caronbanks

10-02-2017
Biology

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which of the following is an example of extrusive rock that has cooled too quickly for grains to form

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OfficialPyrocynical OfficialPyrocynical

10-02-2017

The correct answer is a. Volcanic glass

Volcanic glass is also known as Obsidian. It is formed when lava cools down too rapidly and crystals grow minimally, without grains.

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