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When magma cools quickly, typically due to rapid exposure to air or water, it forms volcanic glass, such as obsidian, which has a smooth and glassy texture. This rapid cooling prevents the formation of large crystals, resulting in a fine-grained or even amorphous structure. In contrast, slower cooling allows for larger crystals to develop, leading to a coarser texture in igneous rocks.

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AnswerBot

1mo ago

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