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frost

(Encyclopedia)frost or hoarfrost, ice formed by the condensation of atmospheric water vapor on a surface when the temperature of the surface is below 32℉ (0℃). In the formation of frost, a gas (water vapor) is ...

hydrothermal vent

(Encyclopedia)hydrothermal vent, crack along a rift or ridge in the deep ocean floor that spews out water heated to high temperatures by the magma under the earth's crust. Some vents are in areas of seafloor spread...

Moore, Michael

(Encyclopedia)Moore, Michael, 1954–, American documentary filmmaker, author, and activist, b. Flint, Mich. A highly personal, populist, and frequently controversial and polarizing documentary filmmaker, he made h...

Topeka

(Encyclopedia)Topeka təpēˈkə [key], city (1990 pop. 119,883), state capital and seat of Shawnee co., NE Kans., on the Kansas River; inc. 1857. In a rich agricultural region, it is an important shipping point fo...

Greensboro

(Encyclopedia)Greensboro. <1> City (2020 pop. 3,648), seat of Greene co., Ga.; inc. 1803 (town); 1855 (city). Founded in 1780, the town lies approx. halfway ...

health maintenance organization

(Encyclopedia)health maintenance organization (HMO), type of prepaid medical service in which members pay a monthly or yearly fee for all health care, including hospitalization. The term “health maintenance organ...

Slim Helú, Carlos

(Encyclopedia)Slim Helú, Carlos cärˈlōs slēm hēlo͞oˈ [key], 1940–, Mexican business executive. The son of a Lebanese Maronite immigrant who became a successful merchant and real-estate investor, Slim was ...

Madinat ash Shab

(Encyclopedia)Madinat ash Shab mədēˈnət ăsh shăb [key], town, SW Yemen, just N of Aden. Formerly called al-Ittihad, it was built in the 1960s as the federal capital of the Federation of South Arabia. From 196...

tax exemption

(Encyclopedia)tax exemption, immunity from the requirement of paying taxes. Federal, state, and usually local law provide exemption from taxation for a wide variety of organizations, usually not-for-profit, such as...

rent control

(Encyclopedia)rent control, in economics and law, government regulation of rent to prevent unreasonable or excessive increases. In the United States, the federal government imposed rent control (and other price con...