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geophysics

(Encyclopedia) geophysics, study of the structure, composition, and dynamic changes of the earth, its atmosphere, hydrosphere and magnetosphere, based on the principles of physics. The term was…

geyser

(Encyclopedia) geysergeysergīˈzər [key] [Icel.], hot spring from which water and steam are ejected periodically to heights ranging from a few to several hundred feet. Notable geysers are found in…

Hammerstein, Oscar, 2d

(Encyclopedia) Hammerstein, Oscar, 2d, 1895–1960, American lyricist and librettist, b. New York City, grad. Columbia, 1916; grandson of Oscar Hammerstein. His first success was Wildflower (1923),…

Iapetus, in astronomy

(Encyclopedia) IapetusIapetusīăpˈĭtəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn VIII (or S8), Iapetus is 907 mi (1460 km) in diameter, orbits…

Easter

(Encyclopedia) Easter [A.S. Eastre, name of a spring goddess], chief Christian feast, commemorating the resurrection of Jesus after his crucifixion. In the West, Easter is celebrated on the Sunday…

United Nations Secretaries-General (table)

(Encyclopedia) United Nations Secretaries-General Secretary-General Nationality Dates in Office Trygve Halvdan Lie Norwegian 1946–53 Dag Hammarskjöld Swedish 1953–61 U Thant Burmese 1962–71…

planetary science

(Encyclopedia) planetary science or planetology, study of planets and planetary systems as a whole. Planetary science applies the theories and methods of traditional disciplines such as astronomy,…

Osiris

(Encyclopedia) OsirisOsirisōsīˈrĭs [key], in Egyptian religion, legendary ruler of predynastic Egypt and god of the underworld. He was the son of the sky goddess Nut and the earth god Geb. The great…