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induction, in electricity and magnetism

(Encyclopedia)induction, in electricity and magnetism, common name for three distinct phenomena. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing ...

Common Weights and Measures (table)

(Encyclopedia)Common Weights and Measures Length Area Volume and Capacity (Liquid and Dry) Weight (Mass) ...

Ticino , river, Switzerland and Italy

(Encyclopedia)Ticino, Lat. Ticinus, river, 154 mi (248 km) long, rising in Ticino canton, S Switzerland, and flowing generally S through Lago Maggiore into N Italy, joining the Po River below Pavia. In Switzerland,...

biological diversity

(Encyclopedia)biological diversity or biodiversity, the number of species in a given habitat. Scientists have variously estimated that there are from 3 to 30 million extant species, of which 2.5 million have been c...

León, city, Mexico

(Encyclopedia)León, city (1990 pop. 758,270), Guanajuato state, central Mexico. It is located in a fertile river valley c.5,600 ft (1,700 m) high, but with a mild, temperate climate. Frequent floods, which in 1888...

Ligurian Sea

(Encyclopedia)Ligurian Sea lĭgyo͝orˈēən [key], arm of the Mediterranean Sea, between the Ligurian coast (Italian Riviera) and the islands of Corsica and Elba; the Gulf of Genoa is its northernmost part. The se...

Kivu, lake, Congo and Rwanda

(Encyclopedia)Kivu, lake, 1,042 sq mi (2,699 sq km), 55 mi (89 km) long, on the Congo-Rwanda border, E central Africa; highest lake in Africa (4,788 ft/1,459 m). It is drained by the Ruzizi River, which flows S int...

Molina, Mario

(Encyclopedia)Molina, Mario (Mario José Molina-Pasquel y Henríquez), 1943–2020, Mexican chemist, Ph.D. Univ. of California, Berkeley, 1972. Molina was a professor at the Univ. of California, Irvine from 1975 to...

Pliocene epoch

(Encyclopedia)Pliocene epoch plīˈəsēn [key], fifth epoch of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), from 5.1 to 2 million years ago. By the beginning of the P...

North Atlantic Drift

(Encyclopedia)North Atlantic Drift, warm ocean current in the northern part of the Atlantic Ocean. It is a continuation of the Gulf Stream, the merging point being at lat. 40°N and long. 60°W. Off the British Isl...