Sedimentary rocks..
Are those rocks which are formed by gradual deposition or sedimentation under water, of weathering products of pre-existing rocks on the surface of earth. The igneous rocks, formed on the surface of the earth by cooling of magma, is subjected to natural weathering agents like rain, air, frost, river, flow, glacier, sea, temperature variations etc..
These weathering agents break or disintegrate the surface rocks. These products of weathered rock are then transported by other agents(wind etc.) from its place of origin and deposited elsewhere. This process of deposition is called the sedimentation process and the rocks so formed are known as sedimentary rocks.
Properties of sedimentary rocks are vary considerably depending upon the nature of sediment and type of bonding that exists between the adjacent sediment grains.
examples: Sand, Stone, Gypsum, Shale etc.
