The Rock Cycle
The rock cycle is a process that the earth always does.
First of all, the magma inside the volcano goes up to the surface and becomes Extrusive Igneous rocks. When the lava cools, it's called Crystallization. Secondly, because of the weathering and erosion, the Igneous rocks split apart and transported to sea, lake, river as sediments. Thirdly, they quickly cover by layers upon layers of sediments and become Sedimentary rocks. The Sediments are compacted and cemented to form a Sedimentary Rock! Forthly, the rocks go down to the earth by geologic forces and become Metamorphic Rocks by intense heat and pressure. Finally, the Metamorphic rocks go up to the volcano and become magma again. This process is called, 'The rock cycle.'
First of all, the magma inside the volcano goes up to the surface and becomes Extrusive Igneous rocks. When the lava cools, it's called Crystallization. Secondly, because of the weathering and erosion, the Igneous rocks split apart and transported to sea, lake, river as sediments. Thirdly, they quickly cover by layers upon layers of sediments and become Sedimentary rocks. The Sediments are compacted and cemented to form a Sedimentary Rock! Forthly, the rocks go down to the earth by geologic forces and become Metamorphic Rocks by intense heat and pressure. Finally, the Metamorphic rocks go up to the volcano and become magma again. This process is called, 'The rock cycle.'
http://www.youtube.com/watch?v=U7YQ5vwaL98