air reverse circulation drilling
21Chernobyl disaster — This article is about the 1986 nuclear plant accident in Ukraine. For other uses, see Chernobyl (disambiguation). Chernobyl disaster …
22arctic — arctically, adv. /ahrk tik/ or, esp. for 7, /ahr tik/, adj. 1. (often cap.) of, pertaining to, or located at or near the North Pole: the arctic region. 2. coming from the North Pole or the arctic region: an arctic wind. 3. characteristic of the… …
23Peak oil — A logistic distribution shaped production curve, as originally suggested by M. King Hubbert in 1956 …
24Natural gas prices — at the Henry Hub in US Dollars per MBtu for the 2000 2010 decade. Natural gas prices, as with other commodity prices, are mainly driven by supply and demand fundamentals. However, natural gas prices may also be linked to the price of crude oil… …
25Dolaucothi Gold Mines — The Dolaucothi Gold Mines (grid reference SN662403), also known as the Ogofau Gold Mine, are Roman surface and deep mines located in the valley of the River Cothi, near Pumsaint, Carmarthenshire, Wales. The gold mines are located within the… …
26Cuba — Cuban, adj., n. /kyooh beuh/; Sp. /kooh vah/, n. a republic in the Caribbean, S of Florida: largest island in the West Indies. 10,999,041; 44,218 sq. mi. (114,525 sq. km). Cap.: Havana. /kooh bah/, n. Cubba. * * * Cuba Introduction Cuba… …
27Mining — This article is about the extraction of geological materials from the Earth. For the municipality in Austria, see Mining, Austria. For the siege tactic, see Mining (military). For name of the Chinese emperor, see Daoguang Emperor. Simplified… …
28occupational disease — 1. Also called industrial disease. a disease caused by the conditions or hazards of a particular occupation. 2. a trait or tendency that develops among members of a particular profession: Cynicism was thought to be an occupational disease of… …
29Elevator — For other uses, see Elevator (disambiguation). A set of lifts in the lower level of a London Underground station. The arrows indicate each elevator s position and direction of travel …
30Hungary — /hung geuh ree/, n. a republic in central Europe. 9,935,774; 35,926 sq. mi. (93,050 sq. km). Cap.: Budapest. Hungarian, Magyarország. * * * Hungary Introduction Hungary Background: Hungary was part of the polyglot Austro Hungarian Empire, which… …
