Geology Fun Fact
Dense as a Rock?
Rocks are generally assumed to be hard, dense objects that would sink in water without a problem. But there are rocks out there that are not dense at all. The least dense rock is pumice, which is produced during a volcanic eruption when lava is blasted into the air and cools. As the lava cools it has a lot of air pockets, or pores, that produce enough buoyancy that pumice can actually float.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxs8QQu7TU4k2PYltnhai4V8MRjVArv_1ThU_G-pk94pjfG12UJiD5UemFsI-ZcF7DWoV1HmvtsMkIx0D6UeMO2C8DyTbkA7fGPORk1QQgPGH2YfcCEPMm5m-5EPr9BqpZQc1O/s1600/GeoFunFact_Pumice.PNG)
Dense as a Rock?
Rocks are generally assumed to be hard, dense objects that would sink in water without a problem. But there are rocks out there that are not dense at all. The least dense rock is pumice, which is produced during a volcanic eruption when lava is blasted into the air and cools. As the lava cools it has a lot of air pockets, or pores, that produce enough buoyancy that pumice can actually float.
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