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

User Murad Tagirov
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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.
User George Alexandria
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