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alkaline earths
alkaline earths , oxides of the alkaline-earth metals , especially of calcium, strontium, and barium. They are not readily soluble in water and form solutions less basic than those of alkalies.
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rare earths
rare earths in chemistry, oxides of the rare-earth metals . They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, although they were once thought to be very scarce. Generally, the name of an earth is formed from the name of its ...
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terrestrial planet
terrestrial planet the earth or a planet that resembles the earth in its physical characteristics. The terrestrial planets in the solar system are the earth , Mercury , Venus , and Mars . These planets are approximately the same size, with the earth the largest. They are considerably denser tha...
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diatom
diatom , unicellular organism of the kingdom Protista , characterized by a silica shell of often intricate and beautiful sculpturing. Most diatoms exist singly, although some join to form colonies. They are usually yellowish or brownish, and are found in fresh- and saltwater, in moist soil, and on ...
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precipitation
precipitation in meteorology, condensed moisture that falls to the surface of the earth in the form of rain , sleet , snow , hail , frost , or dew .
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solar constant
solar constant the average amount of radiant energy received by the earth's atmosphere from the sun; its value is about 2 calories per min incident on each square centimeter of the upper atmosphere. The actual value of the energy varies with several factors; the most important factor is the earth's...
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Alfred Bernhard Nobel
Alfred Bernhard Nobel , 1833-96, Swedish chemist and inventor. Educated in St. Petersburg, Russia, he traveled as a youth and returned to St. Petersburg in 1852 to assist his father in the development of torpedoes and mines. Manufacture of a mixture of nitroglycerine and gunpowder, developed coopera...
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Antaeus
Antaeus , in Greek mythology, giant; son of Poseidon and Gaea, the goddess of the earth. He became stronger whenever he touched the earth, his mother. He killed everyone with whom he wrestled until Hercules overcame him by lifting him in the air.
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Jovian planets
Jovian planets the planets Jupiter , Saturn , Uranus , and Neptune . They are all larger and more massive than the earth. Since they rotate faster, they are more flattened at the poles than are the terrestrial planets . They are less dense than the earth, as they are composed of gaseous matter...
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Nut
Nut , in Egyptian religion, sky-goddess. She was the sister-wife of the earth god Geb, to whom she bore Osiris, Isis, Set, and Nephthys. She was sometimes represented with her hands and feet on the earth and the curve of her body forming the vault of heaven.
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