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Sedimentary rock | Definition, Formation, Examples, Characteristics . . . Sedimentary rock, rock formed at or near Earth’s surface by the accumulation and lithification of sediment or by the precipitation from solution at normal surface temperatures Sedimentary rocks are the most common rocks exposed on Earth’s surface but are only a minor constituent of the entire crust
The Rock Cycle | How Igneous, Sedimentary, Metamorphic Rock Are . . . Furthermore, metamorphic and sedimentary rocks thrust deep underground through subduction may eventually melt to form magma and cool into igneous rock once again The entire process is called the rock cycle The rock cycle takes many millions of years to complete, but it is the key to geologic change on our planet
Rock | Definition, Characteristics, Formation, Cycle, Classification . . . 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 Petrology, Stratigraphy, Rock Types - Britannica Geology - Sedimentary Petrology, Stratigraphy, Rock Types: The field of sedimentary petrology is concerned with the description and classification of sedimentary rocks, interpretation of the processes of transportation and deposition of the sedimentary materials forming the rocks, the environment that prevailed at the time the sediments were deposited, and the alteration (compaction
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 - Evaporites, Deposits, Minerals | Britannica Sedimentary rock - Evaporites, Deposits, Minerals: Evaporites are layered crystalline sedimentary rocks that form from brines generated in areas where the amount of water lost by evaporation exceeds the total amount of water from rainfall and influx via rivers and streams The mineralogy of evaporite rocks is complex, with almost 100 varieties possible, but less than a dozen species are
rock - Students | Britannica Kids | Homework Help Rocks form and change through a natural process called the rock cycle The study of rocks and the processes that form and change them is called geology Types of Rock Geologists broadly classify Earth’s rocks as igneous, sedimentary, or metamorphic rocks Igneous Rock D L Weide Igneous rock forms from magma when it cools and solidifies
Coal - Plant Matter, Carbonization, Sedimentary Rocks | Britannica Coal - Plant Matter, Carbonization, Sedimentary Rocks: It is generally accepted that most coals formed from plants that grew in and adjacent to swamps in warm, humid regions Material derived from these plants accumulated in low-lying areas that remained wet most of the time and was converted to peat through the activity of microorganisms (It should be noted that peat can occur in temperate
Cementation | Diagenesis, Lithification Compaction | Britannica Cementation, in geology, hardening and welding of clastic sediments (those formed from preexisting rock fragments) by the precipitation of mineral matter in the pore spaces It is the last stage in the formation of a sedimentary rock The cement forms an integral and important part of the rock, and
Metamorphic rock | Definition, Formation, Facts | Britannica Metamorphic rock, any rock that results from the alteration of preexisting rocks in response to changing conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks