Classifying Rockssandstone(sedimentary)gneiss(metamorphic,foliated)quartzite(metamorphic,nonfoliated)granite(igneous)shale(sedimentary)slate(metamorphic,foliated)Heat & Pressure© Copyright NewPath Learning. All Rights Reserved. 94-4670Visit www.newpathlearning.com for Online Learning Resources.SedimentarysandstoneconglomeratelimestoneRocks are solid, naturally occurring substances composed of one or more minerals and other matter. Rocks are classified into three groups according to how they were formed: igneous, sedimentary or metamorphic.Sedimentary Rock FormationSedimentary rocks form from weathering, erosion and layering of sediment that takes place over millions of years. Metamorphic Rock Formation Rocks that changed due to intense heat or pressure in the Earth's crust are called metamorphic rocks. Metamorphic rocks are further classified as foliated and nonfoliated. basaltpumicegraniteobsidianlimestonesandstoneconglomerateIgneous Rock FormationIgneous rocks form when liquid rock cools and hardens. Liquid rock that is under the crust is called magma. When it pours out onto the Earth's surface, it is then called lava. PressureHeat
< Page 4 | Page 6 >