Pumice is an example of extrusive igneous rock. The word extrusive means ... When lava erupts from a volcano, it can be as much as 10 times hotter than boiling water! This is why you have to ...

"The locus of future rhyolitic [igneous rock] volcanism has shifted to north-east Yellowstone caldera," according to the team, which was led by Ninfa Bennington, a seismologist with the US ...

This difference in temperature is due to its unusual composition, being the only volcano in the world to ... "Carbonatites are a relatively rare type of igneous rock composed of greater than ...

The class can give an erupting-volcano hand action or a trembly-earthquake action to answer. Volcanic rock is formed when lava or magma cools down and becomes a solid. We call this type of rock ...