Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution. Particles that form a sedimentary rock by accumulating are called sediment. Before being deposited sediment was formed by weathering and erosion in a source area and then transported to the place of deposition by water wind ice mass movement or glaciers which are called agents of denudation. The sedimentary rock cover of the continents of the Earth's crust is extensive but the total contribution of sedimentary rocks is estimated to be only 8% of the total volume of the crust. Sedimentary rocks are only a thin veneer over a crust consisting mainly of igneous and metamorphic rocks. Contains 8 types of Sedimentary rocks: 1 each of Sandstone Shale Conglomerate Halite Travertine Gypsum Limestone and Bituminous Coal. Great set to learn about rock identification. Intended to be parts for use with science projects science fairs etc. and are provided with minimal to no operating instructions.
