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pH
(Encyclopedia)pH, range of numbers expressing the relative acidity or alkalinity of a solution. In general, pH values range from 0 to 14. The pH of a neutral solution, i.e., one which is neither acidic nor alkaline...Tehuantepec, Isthmus of
(Encyclopedia)Tehuantepec, Isthmus of, c.125 mi (200 km) wide at its narrowest, S Mexico, between the Gulf of Campeche and the Gulf of Tehuantepec. It is mostly a rolling, tropical lowland with the lowest pass elev...Zaysan, Lake
(Encyclopedia)Zaysan, Lake zīsänˈ [key], freshwater lake, c.700 sq mi (1,810 sq km), SE Kazakhstan, in the Altai Mts. It is crossed by the Irtysh River. It abounds in fish. The lake has risen 20 ft (6 m) above i...Monadnock
(Encyclopedia)Monadnock mənădˈnŏk [key], isolated peak, 3,165 ft (965 m) high, SW N.H. It is a popular hiking destination, noted for its view. The peak lends its name to the geomorphic term monadnock, an isolat...terrace
(Encyclopedia)terrace, a level field built on top of a hillslope into the floor of a deep valley to improve cultivation of crops. Terracing uses the runoff from the hill to increase soil retentiveness and arability...Salton Sea
(Encyclopedia)Salton Sea sôlˈtən [key], saline lake, 370 sq mi (958 sq km), northern part of the Imperial Valley, SE Calif.; 232 ft (71 m) below sea level. The area was anciently the northern part of the Gulf of...Chesapeake and Delaware Canal
(Encyclopedia)Chesapeake and Delaware Canal, sea-level canal, 19 mi (31 km) long, 250 ft (76 m) wide, and 27 ft (8.2 m) deep, connecting the head of Chesapeake Bay with the Delaware River. Built in 1824–29, the c...Hubbard Glacier
(Encyclopedia)Hubbard Glacier, SE Alaska, largest tidewater glacier in North America, on Disenchantment Bay at head of Yakutat Bay, at the northern end of the Alaskan panhandle. Extending 76 mi (122 km) from Mt. Lo...Ratlam
(Encyclopedia)Ratlam rətlämˈ [key], city (1991 pop. 195,776), Madhya Pradesh state, E central India, on the Mumbai-Delhi RR. Capital of the former state of Ratlam, the town is a district administrative center an...Great Glen
(Encyclopedia)Great Glen or Glen More, valley, 60 mi (97 km) long, Highland, N central Scotland, extending from Moray Firth SW to Loch Linnhe. It was formed by a fault in the earth's surface. Loch Ness, Loch Oich, ...Browse by Subject
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