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astrobleme

(Encyclopedia)astrobleme ăsˈtrōblēmˌ [key], large, circular structure ranging from c.1⁄2 mi to 40 mi (.8–64 km) in diameter. Astroblemes are found at numerous places on the earth's surface, e.g., Meteor, o...

Penza

(Encyclopedia)Penza pyĕnˈzə [key], city (1991 est. pop. 551,000), capital of Penza region, S central European Russia, on the Sura River. It is a large railroad junction and the center of an extensive and fertile...

patina

(Encyclopedia)patina pătˈənə [key], coating of carbonate of copper on articles of copper or bronze, formed after long exposure to a moist atmosphere or burial in the earth. Although commonly green, patina varie...

Phaëthon

(Encyclopedia)Phaëthon fāˈətən [key], in Greek mythology, son of Helios and the nymph Clymene. He tried to drive his father's golden chariot, but he could not control its great steeds. As the chariot plunged t...

Ceres, in Roman religion and mythology

(Encyclopedia)Ceres sîrˈēz [key], in Roman religion and mythology, goddess of grain; daughter of Saturn and Ops. She was identified by the Romans with the Greek Demeter. Her worship was connected with that of th...

Yggdrasill

(Encyclopedia)Yggdrasill ĭgˈdrəsĭl, yo͞ogˈ– [key], in Norse mythology, the great tree of the world. Its branches and roots extended through all the universe—the heavens, the earth, and the underworld. At ...

geyser

(Encyclopedia)geyser gīˈzər [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 Iceland, New Zealand,...

Osiris

(Encyclopedia)Osiris ōsīˈrĭs [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 benefactor of man...

Cassini

(Encyclopedia)Cassini käs-sēˈnē [key], name of a family of Italian-French astronomers, four generations of whom were directors of the Paris Observatory. Gian Domenico Cassini, 1625–1712, was born in Italy and...

subduction zone

(Encyclopedia)subduction zone, large-scaled narrow region in the earth's crust where, according to plate tectonics, masses of the spreading oceanic lithosphere bend downward into the earth along the leading edges o...