Bell Ringer What type of rock is formed when you melt a rock (magma or lava) and then cool it? Igneous Sedimentary Metamorphic Sedimentary Rocks Where are sedimentary rocks found? All over the world and NYS Where do sedimentary rocks form? Under large bodies of water Why do sedimentary rocks form layers? Sorting of sediments (strata) Sedimentary rocks form from sediments They form in two ways 1. from the result of weathering (breaking into smaller pieces)and erosion (moving the sediments) 2. organic processes (from once living things) 3 types of sedimentary rocks: 1. Clastic form from rock fragments that are stuck together Cementation Makes the sediments stick together Most common cements: Quartz Calcite Hematite Clastic Sedimentary Rocks are Identified by Particle Size!!!!!!! Conglomerate: Large particles (rounded) Breccia: Large particles (angular) Other Clastic sedimentary rocks: Sandstone: Sand ( cm) Siltstone: Silt ( cm) Shale: Clay (