Pumice is an example of extrusive igneous rock. The word extrusive means that ... In this picture a geologist uses a pick ax to yank a piece of lava from the overflow. Why is it important to ...

Marble is a metamorphic rock, it is highly decorative and used for statues. Igneous rocks are formed from molten (liquid) rock that has cooled and solidified. The inside of the Earth is so hot ...