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A meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude. The positi ...
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A map projection is a systematic transformation of the latitudes and longitudes of locations on the surface of a sphere or an ellipsoid into locations on a plane. Map projections are necessary for cre ...
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In Earth science, a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through both biotic (biosphere) and abiotic (lithosphere, atmos ...
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Kepler-22b is an extrasolar planet orbiting G-type star Kepler-22. It is located about 600 light years away from Earth in the constellation of Cygnus. It was discovered by NASA's Kepler Space Tele ...
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El origen del hombre, referido al origen o comienzo de la especie humana, remite a dos perspectivas muy distintas. La visión científica sitúa la especie humana como una más en la evolución biológica d ...
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Insects (from Latin insectum, a calque of Greek ??t?µ?? [éntomon], "cut into sections") are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-pa ...
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In the physical sciences, subatomic particles are particles smaller than atoms. There are two types of subatomic particles: elementary particles, which according to current theories are not made of ot ...
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A calendar is a system of organizing days for social, religious, commercial or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. A dat ...
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Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readil ...
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In science and engineering, the weight of an object is usually taken to be the force on the object due to gravity. Its magnitude (a scalar quantity), often denoted by an italic letter W, is the produc ...
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