Buried rock fragments may be further subjected to processes of weathering that cause them to break down into smaller particles or soil, or they may become new rocks through the sedimentary process. The sedimentary process requires time and pressure to create new rocks from rock fragments and sediment.Continue Reading
Rock fragments are typically small pieces of a larger rock formation that have been broken off through erosion by external forces such as fluctuating temperatures, ice, rain or excessive moisture. These fragments may then be transported to new regions where they are deposited and allowed to settle. Over time, the fragments may be buried by new sediment, which allows the process of lithification to begin due to the weight of the new soil. Lithification involves the compaction and cementation of sedimentary materials, which may lead to the creation of new rocks over time.
The size of the rock fragments and the type of weathering that eroded their source rock can affect the type of sedimentary rocks into which they may form. Conglomerate rocks and breccia are formed from larger sized rock fragments such as boulders and pebbles, which are typically found closer to their source rock formation due to their weight. Finer sediments, such as sand, clay and silt, are deposited further from their source and may form into sandstone, shale or siltstone.Learn more about Geology
Metamorphic rocks are formed due to physical and chemical processes, such as heat, pressure and mineral exposure, that change the composition of pre-existing igneous, sedimentary and metamorphic rocks. These processes may be singular, but commonly occur simultaneously.Full Answer >
Geologists classify rocks according to the processes by which they were formed. Igneous, metamorphic and sedimentary rocks have unique histories, and each category is further subdivided into more specific classes that place a rock firmly in the overall geological classification scheme.Full Answer >
Sand is formed by the erosion of rocks, which become tiny particles. These tiny particles are picked up by wind and water and become sand.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 >