How is a igneous and a sedimentary rock different?
Igneous is basically fresh out of a volcano. There are two types: rocks that got cooled slowly, and those that were cooled really fast. After a while, these rocks will break down into sediment, and will form into layers. Then the sediment will go through cementation, where they stick together. At that point, its sedimentary rock! (Like sandstone, in the Grand Canyon!
