rock cycle
The rock cycle is the continual process by which new rocks forms old rock material. Rocks are always changing. It is the process by which a rock forms, and also changes from one type then to another. Then the rock is destoryed and it gets re-formed again by geological processes. Weathering, erosion, heat, and pressure is what creates and destories rock. They way that the rock cycle is formed is first by Erosion, then Deposition, to Compaction and Cementation, Metamorphism, Melting, Cooling, Solidification, and Weathering. Sedimentary Rock goes into heat and pressure to Metamorpic rock and that goes into melting to magma, to cooling, then to Igneous Rock to Weathering and Erosion back to Sedimentary rock.
Holt Science and Thecnology Earth Science pg. 90 http://blogs.misd.k12.wa.us/maguilera/2011/10/06/the-rock-cycle geology.htmlhttp://www.learner.org/interactives/rockcycle/