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precautions against dust

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  • United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …   Universalium

  • Tea — For other uses, see Tea (disambiguation). Tea Longjing tea being infused in a glass …   Wikipedia

  • Pneumoconiosis — Classification and external resources Micrograph of asbestosis (with ferruginous bodies), a type of pneumoconiosis. H E stain. ICD …   Wikipedia

  • space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… …   Universalium

  • History of the Panama Canal — The history of the Panama Canal goes back almost to the earliest explorers of the Americas. The narrow land bridge between North and South America offers a unique opportunity to create a water passage between the Atlantic and Pacific oceans. This …   Wikipedia

  • insurance — /in shoor euhns, sherr /, n. 1. the act, system, or business of insuring property, life, one s person, etc., against loss or harm arising in specified contingencies, as fire, accident, death, disablement, or the like, in consideration of a… …   Universalium

  • Depleted uranium — The DU penetrator of a 30 mm round[1] Depleted uranium (DU; also referred to in the past as Q metal, depletalloy, or D 38) is uranium with a lower content of the fissile isotope U 235 than natural uranium (natural uranium is about 99.27% uranium… …   Wikipedia

  • radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

  • tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

  • Air pollution — from World War II production Smog over …   Wikipedia

  • Chemical weapons in World War I — A poison gas attack using gas cylinders in World War I. The use of chemical weapons in World War I ranged from disabling chemicals, such as tear gas and the severe mustard gas, to lethal agents like phosgene and chlorine. This chemical warfare… …   Wikipedia

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