why does pumice have holes and pockets?
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The pore spaces (known as vesicles) in pumice are a clue to how it forms. The vesicles are actually gas bubbles that were trapped in the rock during the rapid cooling of a gas-rich frothy magma. ... As the magma breaks through Earth's surface, the sudden pressure drop causes the gas to come out of solution.
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The pore spaces (known as vesicles) in pumice are a clue to how it forms. The vesicles are actually gas bubbles that were trapped in the rock during the rapid cooling of a gas-rich frothy magma.
It is not a function. It is the fact that when the lava is released from the huge pressure below ground, large amounts of gas boil out from the rock and become trapped bubbles. Just like the foam on a carbonized drink. Except that the rock solidifies before the bubbles burst, trapping the foam form.
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