Sedimentary rocks are characterised by their formation from the deposition and lithification of rock material. They may be formed through physical and chemical processes, such as mechanical weathering, compaction and dissolving of rock material.Know More
Sedimentary rocks may be formed through a process called lithification, which is the accumulation and compaction of sedimentary materials into solid rocks. Transportation through water systems such as rivers and oceans may cause clay, silt and other sedimentary materials to accumulate and form into rocks such as sandstone and shale. These rocks typically have smooth and rounded edges due to erosion from constant underwater motion.
Sedimentary rocks may be formed through the chemical dissolving and reforming of materials in rocks. Water sources that have a higher rate of evaporation than precipitation may facilitate the accumulation of sedimentary material, creating an environment in which the formation of new rocks becomes possible. Chemical weathering may cause materials such as calcium carbonate to accumulate and form new rocks such as limestone. Calcium carbonate is comprised of organic material, such as shells and coral, that have been broken down and dispersed in water sources and allowed to settle. The chemical properties of these rocks may be altered to form new rocks, such as dolomite, which is the result of limestone exposed to water containing magnesium.Learn More
Sedimentary rocks are made of minerals and debris that have been weathered or eroded from rocks over long stretches of time. This sediment can be laid down by water, by the movement of earth or glaciers, by evaporation or by biological processes.Full Answer >
Sedimentary rocks are primarily characterized by lithification. Lithification occurs when sediment has been deposited and accumulates at the earth's surface or in bodies of water to form a rock over time. Subgroups of sedimentary rocks are defined by their specific formation.Full Answer >
Sedimentary rocks are formed by the deposition of mud, clay, sand and other small particles on the surface of the Earth. Sedimentation can occur in many different environments, including lakes, rivers, deserts and oceans. The sediment is deposited in layers that are compressed over time and turned into solid rock.Full Answer >
Sedimentary rocks are formed from preexisting rock through the combined processes of weathering, transportation, deposition, compacting and cementation. The entire series of processes is known as lithification, and the weathering portion of the process can be either mechanical or chemical. The chemical weathering process involves the preexisting material being transported as a solute or in the form of a new mineral, while the mechanical process transports the material as solid particles.Full Answer >