is a light weight rock with trapped gases and air bubbles inside it
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the answer is prumice.
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it is a volcanic rock filled with tiny bubbles of air.
when lava with a very high content of water and gases is discharged from a volcano, as the gas bubbles escape, the lava becomes frothy. When this lava cools and hardens, the result is a very light rock material filled with tiny bubbles of gas and the rock is called as prumice
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