by Jake Jorgensen and Bryce tallmen
The Three Main Rock Types
Igneous shoots out of a volcano and after a long period of time hardens. Sedimentary Rocks are formed by sediment in rivers get stacked up on top of each other and pressure form a brand new rock called a sedimentary rock. Last but not least the metamorphic rock. It is formed when heat and pressure start to break down a rock and eventually melts to form a metamorphic rock.