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Narva, river, Estonia and Russia

(Encyclopedia)Narva, river, c.50 mi (80 km) long, rising in Lake Peipus (Chudskoye), E Estonia, and flowing northeast past the city of Narva into the Gulf of Finland. It forms the border between Estonia and Russia....

centripetal force and centrifugal force

(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...

Paraguay, river, Brazil and Paraguay

(Encyclopedia)Paraguay, river, c.1,300 mi (2,090 km) long, rising in the highlands of central Mato Grosso state, Brazil. Flowing generally southward, it forms the border between Brazil and Paraguay in the pantanal,...

Carlos, Spanish and Portuguese kings

(Encyclopedia)Carlos. For Spanish and Portuguese kings thus named, use Charles.

National Parks and Monuments (table)

(Encyclopedia)National Parks and Monuments 1 National Parks and Monuments National Monuments National and International Historic Sites and Historical Parks National Memorials National Battlef...

Stephen Dušan

(Encyclopedia)Stephen Dušan or Dushan both: stĕˈfän do͞oˈshän [key], c.1308–1355, king (1331–46) and czar (1346–55) of Serbia, son of Stephen Uros III. He is also known as Stephen Uros IV. He was procl...

Boutros-Ghali, Boutros

(Encyclopedia)Boutros-Ghali, Boutros bo͞oˈtrōs, gäˈlē [key], 1922–2016, Egyptian statesman, secretary-general of the United Nations (1992–96). Born into a politically connected Coptic Christian family, he...