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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
  • 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 rock - Kids | Britannica Kids | Homework Help
    Sedimentary rock is one of three types of rock found on Earth The others are called igneous and metamorphic Igneous and metamorphic rocks are the most common rock types in Earth’s crust Sedimentary rock is the most common rock type found at its surface
  • 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 - Deposition, Stratification, Weathering | Britannica
    Sedimentary rock - Deposition, Stratification, Weathering: The sedimentary environment is the specific depositional setting of a particular sedimentary rock and is unique in terms of physical, chemical, and biological characteristics The physical features of a sedimentary environment include water depth and the velocity and persistence of currents Chemical characteristics of an environment
  • Stratification | Types, Causes Effects | Britannica
    Stratification, the layering that occurs in most sedimentary rocks and in those igneous rocks formed at the Earth’s surface, as from lava flows and volcanic fragmental deposits
  • Sedimentary rock - Stratification, Fossils, Bedding | Britannica
    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 structures include features like bedding, ripple marks, fossil tracks and trails, and mud cracks They conventionally are subdivided
  • 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
  • Texture | Geology, Description, Examples, Facts | Britannica
    Sedimentary rock texture Sedimentary rock texture is determined by the size, shape, and fabric (grain packing and orientation) of the discrete grains or particles in the rock It affects such derived properties of these rocks as porosity, permeability, bulk density, electrical conductivity, and sound transmissibility
  • Compaction | Soil Compaction, Consolidation Compressive Strength . . .
    Compaction, in geology, decrease of the volume of a fixed mass of sediment from any cause, commonly from continual sediment deposition at a particular site Other causes include wetting and drying of sediments in the subsurface, which promotes clay mineral changes and granular reorientations, and





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