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Yuma, city, United States

(Encyclopedia)Yuma yo͞oˈ mə [key], city (1990 pop. 54,923), seat of Yuma co., extreme SW Ariz., on the eastern bank of the Colorado River near the confluence of the Gila River; founded 1854, inc. as a city 1914....

Biosphere 2

(Encyclopedia)Biosphere 2, privately funded ecological research project in which eight people lived sealed in a 3.15-acre (1.28-hectare) structure for two years (Sept. 26, 1991–Sept. 26, 1993). Located in Oracle,...

Bowman, Isaiah

(Encyclopedia)Bowman, Isaiah bōˈmən [key], 1878–1950, American geographer, b. Waterloo, Ont., B.S. Harvard, 1905, Ph.D. Yale, 1909. He taught geography at Yale (1905–15) and was director (1915–35) of the A...

rain

(Encyclopedia)rain, precipitation in liquid form. It consists of drops of water falling from clouds; if the drops are very small, they are collectively termed drizzle. Rain plays a key role in the hydrologic, or wa...

Phoenix, city, United States

(Encyclopedia)Phoenix, city (1990 pop. 983,403), state capital and seat of Maricopa co., S Ariz., on the Salt River; inc. 1881. It is the largest city in Arizona, the hub of the rich agricultural region of the Salt...

Rift Valley fever

(Encyclopedia)Rift Valley fever, acute viral disease that affects domestic livestock and can be transmitted to humans. The disease is most common in E and S Africa, but also occurs widely in sub-Saharan Africa and ...

Indian Ocean

(Encyclopedia)Indian Ocean, third largest ocean, c.28,350,000 sq mi (73,427,000 sq km), extending from S Asia to Antarctica and from E Africa to SE Australia; it is c.4,000 mi (6,400 km) wide at the equator. It con...

Karachi

(Encyclopedia)Karachi kəräˈchē [key], city (1998 pop. 9,269,265), largest city and former capital of Pakistan, SE Pakistan, on the Arabian Sea near the Indus River delta. The capital of Sind prov., it is Pakist...

Bombay

(Encyclopedia)Bombay bŏmbāˈ [key], former state, W central India, on the Arabian Sea. The state contained within its borders the former Portuguese colonies of Goa and Daman and Diu. Historical remains exist from...

North West

(Encyclopedia)North West, province (2011 pop. 3,509,953), 40,495 sq mi (104,882 sq km), N central South Africa. In 1994, under South Africa's post-apartheid constitution, North West was created from parts of the fo...