Explanation:

Explanation: Sedimentary rocks are formed from pre-existing rocks or pieces of once-living  organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks  often have distinctive layering or bedding. Many of the picturesque views of the desert southwest  show mesas and arches made of layered sedimentary rock.
1. Common Sedimentary Rocks: Common sedimentary rocks include sandstone, limestone, and  shale. These rocks often start as sediments carried in rivers and deposited in lakes and oceans.  When buried, the sediments lose water and become cemented to form rock. Tuffaceous  sandstones contain volcanic ash.
2. Clastic Sedimentary Rocks: Clastic sedimentary rocks are the group of rocks most people think  of when they think of sedimentary rocks. Clastic sedimentary rocks are made up of pieces (clasts)  of pre-existing rocks. Pieces of rock are loosened by weathering, then transported to some basin  or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted  and cemented, forming sedimentary rock. Clastic sedimentary rocks may have particles ranging in  size from microscopic clay to huge boulders. Their names are based on their clast or grain size.  The smallest grains are called clay, then silt, then sand. Grains larger than 2 millimeters are called  pebbles. Shale is a rock made mostly of clay, siltstone is made up of silt-sized grains, sandstone is  made of sand-sized clasts, and conglomerate is made of pebbles surrounded by a matrix of sand  or mud.
3. Biologic Sedimentary Rocks: Biologic sedimentary rocks form when large numbers of living things die. Chert is an example for  this type of rock, and this is one of the ways limestone can form. Limestone can also form by precipitating out of the water.