Geologic Rock Cycle

Igneous  Transportation  Erosion  Weathering Sedimentary

 Compaction  Cementation  Crystallization Metamorphic

 Under high pressure and heat  Rocks melt and become liquid Magma

 Intrusive Cooling (beneath Earth’s surface)  Extrusive Cooling (above Earth’s surface) Igneous

Igneous Rocks Igneous rocks are rocks that have cooled from a molten state. ïCoarse or fine grained mineral content ïGlassy textures (rapid cooling) ïGranite, basalt, obsidian, and pumice are examples Granite MountainsNatural Basalt Columns

Sedimentary Rocks Sedimentary rocks are sediment held together by cementing agents ïComposed of particles of gravel, sand, silt and clay ïStratification, or bedding, is most significant feature ïSandstones, shales, limestone, and fossils are examples Sandstone, erodedStratification

Metamorphic Rocks Xenoblastic garnet Metamorphic rocks are formed from pre-existing rocks under heat and pressure ïMay be found at the surface when overlying rocks are eroded ïSlate, marble, quartzite, and shale are examples Marble