Columbia Encyclopedia

(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 ...

(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...

(Encyclopedia) blenny, common name of various species of extremely numerous small fishes belonging to the suborders Blennioidei (blennies) and Notothenioidei (Antarctic blennies). They are characterized by elongated...

(Encyclopedia) Callias kălˈēəs [key], fl. 449 b.c., Athenian statesman; he was related to Cimon and also to Aristides. He distinguished himself at the battle of Marathon (490 b.c.) and was a three-time winner of...

(Encyclopedia) Canyonlands National Park, 337,598 acres (136,679 hectares), SE Utah; est. 1964. Located in a desert region, the park contains a maze of deep canyons and many unusual features carved by wind and water...

(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...

(Encyclopedia) hydra hīˈdrə [key], common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Hydras are widely distributed in lakes, ponds, and sluggish stre...

(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...

(Encyclopedia) Juan Fernández hwän fārnänˈdās [key], group of small islands, S Pacific, c.400 mi (640 km) W of Valparaiso, Chile. They belong to Chile and are constitutionally a special territory; they are adm...

(Encyclopedia) yarrow, a plant of the genus Achillea, perennial herbs of the family Asteraceae (aster family), native to north temperate regions. Several species are cultivated as ornamentals for their flat-topped c...