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.
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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