Sedimentary Rock Chapter 4 Section 3
Sedimentary Rock Forms when wind or water deposit sediment Sediment – small pieces of material that come from rock or living material
Processes Erosion – running water, wind or ice carry away fragments of weathered rock Deposition – wind, water and ice slows and sediment settles out in layers Compaction – sediment is pressed together Cementation – dissolved minerals crystallize and glue particles of sediment together
Types of Sedimentary Rock Clastic rock – rock formed when fragments are squeezed together Rock Fragments can range in size
Examples of Clastic Sedimentary Rock Sandstone – sand from beaches or sand dunes Shale – clay particles Breccia - Rock fragments with sharp edges Conglomerate – rounded fragments of rock
Types of Sedimentary Rock Organic Rocks –formed from once living things Examples Coal – formed from plants that died millions of years ago Limestone –formed from ocean creatures
Types of Sedimentary Rock Chemical Rocks – when minerals that are dissolved in solution crystallize Examples: Limestone – from dissolved calcite Rock Salt – from dissolved halite
Uses of Sedimentary Rock Tools Building materials