Sediment
SEDIMENTARY ROCKS. Sedimentary rocks are made of particles of sediments such as sand and clay, or the skeletons and shells of sea creatures. When layers of loose sediment are buried and pressed down under more layers, the particles slowly cement together and lithify (form rock). Sedimentary rocks. Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks often have distinctive layering or bedding.  The weight of the sediments on top squashes the sediments at the bottom. This is called compaction. The water is squeezed out from between the pieces of rock and crystals of different salts form. The crystals form a sort of glue that sticks or cements the pieces of rock together. This process is called cementation. These processes eventually make a type of rock called sedimentary rock. It may take millions of years for sedimentary rocks to form. When rocks are weathered and eroded (worn down), they break up into smaller pieces called sediment. Over time, the sediment may be moved by wind and rain to rivers, lakes, and oceans. Other sediments form from the shells of animals and from plants. Eventually, these sediments get buried and are squashed together to form sedimentary rocks. Sedimentary rocks make up 80–90 per cent of the rocks on the Earth’s surface. 1  Rock cycle. Fossil of shell. Fossils are very common in sedimentary rocks, such as limestone, but rare in metamorphic rocks, such as marble. Fossils are never found in igneous rocks, such as granite. Sedimentary rock layers settle over the dead animals and plants that then turn into fossils. Sedimentary Rocks. Sedimentary rocks are formed from broken down bits of other rocks or even from the remains of plants or animals. The little pieces collect in low-lying areas by lakes, oceans, and deserts. They are then compressed back into rock by the weight of the materials around them and on top of them. Sedimentary rocks are formed in three ways from these different sized sediments. A sedimentary rock is a layered rock that is formed from the compaction, cementation, and the recrystallization of sediments. Compaction is the squeezing together of layers of sediment due to the great weight of overlying layers of rock. Non-clastic sedimentary rocks form from the precipitation (Precipitation is the separating of a solid from a solution) of minerals from ocean water or from the breakdown of the shells and bones of sea creatures. Sea animals such as coral produce calcium carbonate solutions that harden to form rock. The type of rock that forms where the remains of plants and animals are deposited in thick layers are called organic sedimentary rock. 10 people found this useful. Edit. Share to: Answered.  Other sediments form from the shells of animals and from plants. Eventually, these sediments get buried and are squashed together to form sedimentary rocks. Sedimentary rocks make up 80–90 per cent of the rocks on the Earth’s surface. 1  Rock cycle. Other sediments form from the skeletons of animals, and from plants and other living things. Eventually, these sediments get buried and are squashed together to form sedimentary rocks. Sedimentary rocks make up around 75 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. Clastic sedimentary rocks are composed of silicate minerals and rock fragments that were transported by moving fluids (as bed load, suspended load, or by sediment gravity flows) and were deposited when these fluids came to rest. Fossil of shell. Fossils are very common in sedimentary rocks, such as limestone, but rare in metamorphic rocks, such as marble. Fossils are never found in igneous rocks, such as granite. Sediment layers settle over the dead animals and plants that then turn into fossils. Other sediments form from the skeletons of animals, and from plants and other living things. Eventually, these sediments get buried and are squashed together to form sedimentary rocks. Sedimentary rocks make up around 75 per cent of the rocks on the Earth’s surface. 1  Rock cycle.
http://www.factmonster.com/dk/science/encyclopedia/rocks.html http://geomaps.wr.usgs.gov/parks/rxmin/rock2.html http://www.bbc.co.uk/bitesize/ks3/science/environment_earth_universe/rock_cycle/revision/3/ http://www.dkfindout.com/uk/earth/rocks-and-minerals/sedimentary-rocks/ http://www.coolkidfacts.com/sedimentary-rocks/ http://volcano.oregonstate.edu/book/export/html/1056 http://www.answers.com/Q/Sedimentary_rocks_that_are_formed_partially_by_animals_and_plants_are_called_what http://www.dkfindout.com/uk/earth/rocks-and-minerals/sedimentary-rocks/#! https://en.wikipedia.org/wiki/Sedimentary_rock http://www.dkfindout.com/uk/earth/rocks-and-minerals/sedimentary-rocks/#!
Sedimentary rocks that are formed partially by animals and plants are called what?