When an igneous rock forms on top of the Earth's surface it cools quickly and there is almost no time for crystals to form. Obsidian shown below is an example. What type of igneous rock is this?

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asked Jan 27, 2021 28.5k views

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When an igneous rock forms on top of the Earth's surface it cools quickly and there is almost no time for crystals to form. Obsidian shown below is an example. What type of igneous rock is this?

Biology
high-school

Gagan asked

by Gagan

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Answer:one of the three main rock of cooling and solidification of magma or lava

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Grisell answered Feb 1, 2021

by Grisell

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