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What condition causes pumice to be so porous

What condition causes pumice to be so porous
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What condition causes pumice to be so porous

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User Piyush Singh
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When the frothy magma starts to cool, it cools too fast for the atoms to make a crystal structure so it cools with bubbles inside. Because of this, pumice is able to float.
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User MrEyes
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2 votes
the rapid release of air/ gas bubbles during cooling
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User Justincely
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