Sedimentary rock | Definition, Formation, Examples,
2024年10月30日 · sedimentary rock, rock formed at or near Earth’s surface by the accumulation and lithification of sediment (detrital rock) or by the precipitation from solution at normal surface temperatures (chemical rock).
Rock | Definition, Characteristics, Formation, Cycle, Classification ...
2024年10月22日 · Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes. The three major classes of rock are igneous, sedimentary, and metamorphic rock.
Sedimentary rock - Clastic, Chemical, Organic | Britannica
2024年10月30日 · Sedimentary rock - Clastic, Chemical, Organic: Conglomerates and breccias are sedimentary rocks composed of coarse fragments of preexisting rocks held together either by cement or by a finer-grained clastic matrix.
Sedimentary rock - Stratification, Fossils, Bedding | Britannica
2024年10月30日 · Sedimentary rock - Stratification, Fossils, Bedding: Sedimentary structures are the larger, generally three-dimensional physical features of sedimentary rocks; they are best seen in outcrop or in large hand specimens rather than through a microscope.
sedimentary rock - Kids | Britannica Kids | Homework Help
Sedimentary rocks can be put into groups according to the way they are created and the size of the fragments that they contain. The types that form from particles that are worn away from another rock include conglomerates, sandstones, and mudstones.
sedimentary rock - Students | Britannica Kids | Homework Help
Sedimentary rocks are produced by the weathering of old rocks, which breaks apart the rocks into particles or fragments called sediment. The loose grains of sediment are typically deposited and then compacted or cemented together, and this process forms a new type of rock.
Sedimentary rock - Sandstones, Clastic Rocks, Stratification
2024年10月30日 · Sandstone mineralogy is the best indicator of sedimentary provenance: the nature of a sedimentary rock source area, its composition, relief, and location. Sandstone textures and sedimentary structures also are reliable indexes of the transportational agents and depositional setting.
Sedimentary rock - Oil, Natural Gas, Formation | Britannica
2024年10月30日 · Sedimentary rock - Oil, Natural Gas, Formation: Natural gas refers collectively to the various gaseous hydrocarbons generated below Earth’s surface and trapped in the pores of sedimentary rocks. Major natural gas varieties include methane, ethane, propane, and butane.
Sedimentary rock - Wackes, Stratification, Deposition | Britannica
2024年10月30日 · Sedimentary rock - Wackes, Stratification, Deposition: Wacke, or graywacke, is the name applied to generally dark-coloured, very strongly bonded sandstones that consist of a heterogeneous mixture of rock fragments, feldspar, and quartz of sand size, together with appreciable amounts of mud matrix.
Sedimentary rock - Classification, Deposits, Types | Britannica
2024年10月30日 · Specific varieties discussed below include siliceous rocks (cherts), phosphate rocks (phosphorites), evaporites, iron-rich sedimentary rocks (iron formations and ironstones), and organic-rich (carbonaceous) deposits in sedimentary rocks (coal, oil shale, and petroleum).