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coal mining
(Encyclopedia) coal mining, physical extraction of coal resources to yield coal; also, the business of exploring for, developing, mining, and transporting coal in any form. Coal has been historically…Titan , in astronomy
(Encyclopedia) TitanTitantīˈtən [key], in astronomy, the largest of the named moons, or natural satellites, of Saturn. Also known as Saturn VI (or S6), Titan is 3,200 mi (5,150 km) in diameter,…harrier, breed of dog
(Encyclopedia) harrier, breed of medium-sized hound whose origin is obscure but whose existence in England dates from the 13th cent. It stands from 19 to 21 in. (48.3–53.3 cm) high at the shoulder…infanticide
(Encyclopedia) infanticideinfanticideĭnfănˈtəsīd [key] [Lat.,=child murder], the putting to death of the newborn with the consent of the parent, family, or community. Infanticide often occurs among…incubator
(Encyclopedia) incubator, apparatus for the maintenance of controlled conditions in which eggs can be hatched artificially. Incubator houses with double walls of mud, a fireroom, and several…mastodon
(Encyclopedia) mastodonmastodonmăsˈtədŏnˌ [key], name for a number of prehistoric mammals of the extinct genus Mammut, from which modern elephants are believed to have developed. The earliest known…mantis shrimp
(Encyclopedia) mantis shrimp, marine crustacean of the order Stomatopoda, characterized by a pair of enlarged appendages, called maxillipeds, that form powerful claws for seizing prey. The last two…luminosity
(Encyclopedia) luminosity, in astronomy, the rate at which energy of all types is radiated by an object in all directions. A star's luminosity depends on its size and its temperature, varying as the…chorus, in Greek drama
(Encyclopedia) chorus, in the drama of ancient Greece. Originally the chorus seems to have arisen from the singing of the dithyramb, and the dithyrambic chorus allegedly became a true dramatic chorus…chigoe
(Encyclopedia) chigoechigoechĭgˈō [key] or jigger, small parasitic flea (Tunga penetrans) of the tropics and subtropics, including the S United States. Humans and their domestic animals are the main…Trending
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