![]() This occurs as water travels through Earth’s crust, weathering the rock and dissolving some of its minerals, transporting it elsewhere. A chemical precipitate is a chemical compound-for instance, calcium carbonate, salt, and silica-that forms when the solution it is dissolved in, usually water, evaporates and leaves the compound behind. Chemical sedimentary rocks, like limestone, halite, and flint, form from chemical precipitation. ![]() Once the sediment settles somewhere, and enough of it collects, the lowest layers become compacted so tightly that they form solid rock. Through the process of erosion, these fragments are removed from their source and transported by wind, water, ice, or biological activity to a new location. The formation of clastic and organic rocks begins with the weathering, or breaking down, of the exposed rock into small fragments. Organic sedimentary rocks, like coal, form from hard, biological materials like plants, shells, and bones that are compressed into rock. Clastic sedimentary rocks, like sandstone, form from clasts, or pieces of other rock. There are three different types of sedimentary rocks: clastic, organic (biological), and chemical. Sedimentary Rocks Sedimentary rocks are formed from pieces of other existing rock or organic material. Each of these rocks are formed by physical changes-such as melting, cooling, eroding, compacting, or deforming-that are part of the rock cycle. There are three main types of rocks: sedimentary, igneous, and metamorphic.
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