Sedimentary rocks are formed by the deposition and subsequent cementation on the material at the Earth’s surface within the bodies of water. These rocks are formed by four ways – deposition of weathered remains of other rocks, accumulation and the consolidation of sediments, deposition of the results of biogenic activity and lastly from precipitation from solution. Some common types of sedimentary rocks – limestone, chalk, clay, sandstone, and shale. These rocks cover 75% of the total earth’s surface.