Pumice is a very light colored, frothy volcanic rock that is formed from lava that is full of gas. During an eruption the lava is ejected and shot through the air . As the lava hurtles through the air it cools and the gases escape leaving the rock full of holes. This makes the rock very light, so light it can float on water.
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Nicole Carpenter (Reade Advanced Materials)
1680 Omalley, United States
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