What condition causes pumice to be so porous? A. the slow cooling of lava B. the loss of the crystals that were formed during cooling C. the rapid release of numerous gas bubbles during cooling D. erosion by acid rain that is produced after a volcanic explosion

Question

04-05-2017
Biology

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What condition causes pumice to be so porous? A. the slow cooling of lava B. the loss of the crystals that were formed during cooling C. the rapid release of numerous gas bubbles during cooling D. erosion by acid rain that is produced after a volcanic explosion

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TenishaTon TenishaTon · Answer 1 · 2018-11-16T08:23:04+01:00

The correct answer is (c)The rapid release of numerous gas bubbles during cooling.

Pumice is created when super heated highly pressurized rock is ejected from volcano. The foamy nature of pumice is due to continuous cooling and depressurization. This depressurization creates gas molecules in pumice. When the lava is hot many gas molecules are present in it and the cooling of lava under high pressure leads to eruption of these gas molecules. This makes the pumice stone porous.