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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 ...

Dione, in astronomy

(Encyclopedia)Dione dīōˈnē [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn IV (or S4), Dione is 695 mi (1,120 km) in diameter, orbits Saturn at a mean distanc...

Dalian

(Encyclopedia)Dalian or Talien both: däˈlyĕnˈ [key], Rus. Dalny, Jap. Dairen, city (1994 est. pop. 1,855,200), S Liaoning prov., China, on the Liaodong peninsula in the Bay of Korea. It has annexed Lüshun (Por...

coast guard

(Encyclopedia)coast guard, special naval force assigned to seaboard duties. Its primary responsibilities usually consist in suppressing contraband trade and aiding vessels in distress. The British coast guard was e...

Helsinki

(Encyclopedia)Helsinki hĕlˈsĭngkē [key], Swed. Helsingfors, city (2020 pop. 653,835), capital of Finlan...

geomorphology

(Encyclopedia)geomorphology, study of the origin and evolution of the earth's landforms, both on the continents and within the ocean basins. It is concerned with the internal geologic processes of the earth's crust...

gas

(Encyclopedia)gas, in physics, one of the three commonly recognized states of matter, the other two being solid and liquid. A substance in the gaseous state has neither definite shape nor definite volume. Like liqu...

Juneau

(Encyclopedia)Juneau jo͞oˈnō [key], city (1990 pop. 26,751), state capital, SE Alaska, in the Alaska Panhandle; settled by gold miners 1880, inc. 1900. A port on Gastineau Channel, Juneau is a trade center for t...

Ontario, Lake

(Encyclopedia)Ontario, Lake, 7,540 sq mi (19,529 sq km), 193 mi (311 km) long and 53 mi (85 km) at its greatest width, between SE Ont., Canada, and NW N.Y.; smallest and lowest of the Great Lakes. It has a surface ...

Ob

(Encyclopedia)Ob ôp [key], river, c.2,300 mi (3,700 km) long, W Siberian Russia. With the Irtysh River, its chief tributary, it is c.3,460 mi (5,600 km) long and is the world's fourth longest river. Formed by the ...