Question

Explain why pumice rock floats on water even it is too heavier??

Answer 1

Pumice floats on water because it has an incredibly low density due to the air bubbles inside of it. As it is blown out of a volcano (extrusive igneous), and dissolved gasses exsolve and more air gets into it before it hardens into pumice. The less dense air offsets the more dense rock, causing it to float.

Answer 2

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forms when volcanic gases exsolving from viscous magma form bubbles that remain within the viscous magma as it cools to glass. ... Pumiceis considered a glass because it has no crystal structure. Pumice varies in density according to the thickness of the solid material between the bubbles; many samples float in water.

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