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Pumice floats because of pockets of gas in pores as tiny as a human hair.
Pumice is formed from rapidly cooling lava, creating a lightweight material full of holes, or pores. These are full of air, which keeps the pumice afloat.
No matter how deep you dunk it, it will pop right back up! Such a fun science experiment!
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Review The Floater - The Rock that Floats!
