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  • 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
  • Igneous rock | Characteristics, Examples, Formation, Types - Britannica
    igneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of molten earth material Igneous rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary
  • Geology - Earth Composition, Rocks, Minerals | Britannica
    Limestones, which are widely distributed on all continents, consist largely of only two minerals, calcite and dolomite Many rocks have a more complex mineralogy, and in some the mineral particles are so minute that they can be identified only through specialized techniques
  • Geology | Definition, Examples, Rocks, Study, Importance, Facts . . .
    An introduction to the geochemical and geophysical sciences logically begins with mineralogy, because Earth’s rocks are composed of minerals—inorganic elements or compounds that have a fixed chemical composition and that are made up of regularly aligned rows of atoms
  • rock - Students | Britannica Kids | Homework Help
    Most rocks contain several types of minerals; for example, the igneous rock granite is largely composed of the minerals quartz, feldspar, and mica In contrast, pure sandstone, a sedimentary rock, contains only the mineral quartz
  • Geology - Petrology, Rocks, Minerals | Britannica
    Petrology is the study of rocks, and, because most rocks are composed of minerals, petrology is strongly dependent on mineralogy In many respects mineralogy and petrology share the same problems; for example, the physical conditions that prevail (pressure, temperature, time, and presence or absence of water) when particular minerals or mineral
  • Sedimentary rock | Definition, Formation, Examples, Characteristics . . .
    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 - Kids | Britannica Kids | Homework Help
    Rock, or stone, is a hard material made up of one or more minerals Rock makes up the outer layer of Earth, called the crust The lower parts of this layer are solid rock, or…
  • Metamorphic rock | Definition, Formation, Facts | Britannica
    metamorphic rock, any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components
  • mineral - Kids | Britannica Kids | Homework Help
    Minerals make up Earth’s rocks, sands, and soils They are found on Earth’s surface as well as deep underground Minerals are inorganic substances, meaning that they do not come from an animal or a plant Mineralogy is the science of minerals Mineralogists, or people who study minerals, have identified hundreds of minerals





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