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Mississippi, river, United States

(Encyclopedia)Mississippi, river, principal river of the United States, c.2,350 mi (3,780 km) long, exceeded in length only by the Missouri, the chief of its numerous tributaries. The combined Missouri-Mississippi ...

flood, in hydrology

(Encyclopedia)flood, inundation of land by the rise and overflow of a body of water. Floods occur most commonly when water from heavy rainfall, from melting ice and snow, or from a combination of these exceeds the ...

Missouri, river, United States

(Encyclopedia)Missouri, river, c.2,565 mi (4,130 km) long (including its Jefferson-Beaverhead-Red Rock headstream), the longest river of the United States and the principal tributary of the Mississippi River. The l...

Elbe

(Encyclopedia)Elbe ĕlˈbə [key], Czech Labe, a major river of central Europe, c.725 mi (1,170 km) long, rising in the Krknoše Mts., NW Czech Republic, and traversing NW Czech Republic in a wide arc. It then cuts...

Dzungaria

(Encyclopedia)Dzungaria jo͝ongˈgärˈ [key], physical region (c.300,000 sq mi/777,000 sq km) of Xinjiang Uygur Autonomous Region, NW China. It is a largely steppe and semidesert basin surrounded by high mountains...

East Riding of Yorkshire

(Encyclopedia)East Riding of Yorkshire, district and unitary authority, NE England. The district extends from the Yorkshire Wolds (N) to the River Humber (S) and from...

daisy

(Encyclopedia)daisy [O.E.,=day's eye], name for several common wildflowers of the family Asteraceae (aster family). The daisy of literature, the true daisy, is Bellis perennis, called in the United States English d...

chaparral

(Encyclopedia)chaparral chăpərălˈ [key], type of plant community in which shrubs are dominant. It occurs usually in regions having from 10 to 20 in. (25–50 cm) of rainfall annually and with a Mediterranean-ty...

eutrophication

(Encyclopedia)eutrophication yo͞otrōˌfĭkāˈshən [key], aging of a lake by biological enrichment of its water. In a young lake the water is cold and clear, supporting little life. With time, streams draining i...

Amu Darya

(Encyclopedia)Amu Darya or Amudarya both: ämo͞oˈ däryäˈ, äˈmo͞o därˈyə [key], river, c.1,600 mi (2,580 km) long, formed by the junction of the Vakhsh and Pandj rivers, which rise in the Pamir Mts. of ce...