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snow line

(Encyclopedia)snow line, altitude above which or latitude beyond which snow does not melt in summer (usually called the permanent snow line), or, in winter, the line to which snow extends at a given point in time. ...

Backus, John Warner

(Encyclopedia)Backus, John Warner, 1924–2007, American computer scientist, b. Philadelphia, grad. Columbia (M.A. 1950). Trained as a mathematician, he was hired (1950) by IBM Corp. as a computer programmer. From ...

Massapequa Park

(Encyclopedia)Massapequa Park, residential village (1990 pop. 18,044), Nassau co., SE N.Y., on Long Island; inc. 1931. Nearby is Bethpage State Park, with its championship-level golf courses. ...

Kurile Lake

(Encyclopedia)Kurile Lake, crater lake, 29 sq mi (76 sq km), 130 mi (209 km) SSW of Petropavlovsk, Russia, near the tip of the Kamchatka Peninsula. Located in a rugged volcanic region and lying some 330 ft (100 m) ...

Poopó

(Encyclopedia)Poopó pōˌōpōˈ [key], salt lake, on the high plateau of W Bolivia. It is more than 11,000 ft (3,353 m) above sea level. Although it is Bolivia's second largest lake (965 sq mi/2,499 sq km) when w...

plateau

(Encyclopedia)plateau, elevated, level or nearly level portion of the earth's surface, larger in summit area than a mountain and bounded on at least one side by steep slopes, occurring on land or in oceans. Some pl...

Elk Island National Park

(Encyclopedia)Elk Island National Park, 75 sq mi (194 sq km), central Alta., Canada, near Edmonton; est. 1913. It occupies a wooded rolling region in the midst of level farmland. The park is Canada's major fenced p...

water table

(Encyclopedia)water table, the top zone of soil and rock in which all voids are saturated with water. The level of the water table varies with topography and climate, and depends on the degree to which the groundwa...

sanitary science

(Encyclopedia)sanitary science, principles of health preservation, embracing hygiene, on an individual level, and public health, on a communal level. Those who specialize in sanitary science are sanitary engineers....

hydrometer

(Encyclopedia)hydrometer hīdrŏmˈətər [key], device used to determine directly the specific gravity of a liquid. It usually consists of a thin glass tube closed at both ends, with one end enlarged into a bulb t...