Columbia Encyclopedia

(Encyclopedia) Pollonarrua or Polonnaruwa both: pŏlˌənəro͞oˈə [key], ruined ancient city, NE Sri Lanka. Pollonarrua, beautifully situated on a lake, was once the most splendid city of Sri Lanka. It became a r...

(Encyclopedia) Rainbow Bridge National Monument, 160 acres (65 hectares), S Utah; est. 1910. Rainbow Bridge, the largest natural bridge in the world, is a symmetrical, pink, sandstone arch, 309 ft (94 m) high, 33 ft...

(Encyclopedia) San Angelo săn ănˈjəlō [key], city (1990 pop. 84,474), seat of Tom Green co., W Tex., where two forks join to form the Concho River; laid out 1869, inc. 1903. It is an important wool and mohair m...

(Encyclopedia) Ellicott City, city (2020 pop. 75,947), seat of Howard co., in Baltimore and Howard cos., central Md., on the Patapsco River; settled 1774 as Ellicott M...

(Encyclopedia) Alton ôlˈtən [key], city, Madison co., SW Ill., on bluffs of the Mississippi River 5 mi (8.1 km) above its confluence with the Missouri; inc. 1837. Alton is a shipping ...

(Encyclopedia) Lilburne, John, 1614?–1657, English political leader and pamphleteer of the Levelers. He was tried before the court of the Star Chamber as early as 1638 for printing and distributing antiepiscopal w...

(Encyclopedia) Marcus Aurelius (Marcus Aelius Aurelius Antoninus) märˈkəs ôrēˈlēəs [key], 121–180, Roman emperor, named originally Marcus Annius Verus. He was a nephew of Faustina, the wife of Antoninus Pi...

(Encyclopedia) ionosphere īŏnˈəsfēr [key], series of concentric ionized layers forming part of the upper atmosphere of the earth from around 30 to 50 mi (50 to 80 km) to 250 to 370 mi (400 to 600 km) where it m...

(Encyclopedia) Hampden, John hămpˈdən, hămˈ– [key], 1594–1643, English parliamentary leader; cousin of Oliver Cromwell. He entered Parliament in 1621, became closely associated with Sir John Eliot, and was ...

(Encyclopedia) meteor, appearance of a small particle flying through space that interacts with the earth's upper atmosphere. While still outside the atmosphere, the particle is known as a meteoroid. Countless meteor...