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Superior, Lake

(Encyclopedia)Superior, Lake, largest freshwater lake in the world, 31,820 sq mi (82,414 sq km), 350 mi (563 km) long and 160 mi (257 km) at its greatest width, bordered on the W by NE Minnesota, on the N and E by ...

Sacramento, river, United States

(Encyclopedia)Sacramento, longest river of Calif., c.380 mi (610 km) long, rising near Mt. Shasta, N Calif., and flowing generally SW to Suisun Bay, an arm of San Francisco Bay, where it forms a large delta with th...

Teagarden, Jack

(Encyclopedia)Teagarden, Jack (Weldon Leo Teagarden), 1905–64, American jazz trombonist and singer, b. Vernon, Tex. One of the earliest white bluesmen, he came from a jazz-playing family and was mainly self-taugh...

thresher shark

(Encyclopedia)thresher shark, long-tailed, warm-water shark, genus Alopias. The upper fork of its tail is slender and sickle-shaped and is about equal in length to the rest of the body. This shark uses its tail str...

Constellation, ship

(Encyclopedia)Constellation kŏnstĭlāˈshən [key], U.S. frigate, launched in 1797. It was named by President Washington for the constellation of 15 stars in the U.S. flag of that time. The frigate was built to s...

Chesapeake, ship

(Encyclopedia)Chesapeake, U.S. frigate, famous for her role in the Chesapeake affair (June 22, 1807) and for her battle with the H.M.S. Shannon (June 1, 1813). The Chesapeake left Norfolk, Va., for the Mediterranea...

geochemistry

(Encyclopedia)geochemistry, study of the chemical changes on the earth. More specifically, it is the study of the absolute and relative abundances of chemical elements in the minerals, soils, ores, rocks, water, an...

porgy

(Encyclopedia)porgy pôrˈgē [key], common name for members of the Sparidae, a family of small-mouthed fishes with strong teeth adapted for crushing their food of shellfish and crustaceans. Porgies are found in wa...

opal

(Encyclopedia)opal ōˈpəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO2·nH2O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is usually colorless...

Frisian Islands

(Encyclopedia)Frisian Islands frĭzhˈən [key], chain of low-lying islands, off the coasts of the Netherlands, Germany, and Denmark, in the North Sea. The West Frisian Islands, also known as the Wadden Islands, be...