Why pumice stone is very light and floats on water?
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During the eruption, volcanic gases dissolved in the liquid portion of verz viscous magma expand very rapidly to create a foam or froth; the liquid part of the froth then quickly solidifies to glass around the gas bubbles. The volume of gas bubbles is usually so large that pumice is lighter than water and floats.
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When the lava cools very fast, air leaves it and forms holes. Because of cooling very fast it turns into stone. This stone is very light because of the holes in it and as a result it floated on water.
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