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period, in geologic time
(Encyclopedia)period, unit of time on the geologic timescale. Periods are shorter than an era and longer than an epoch. Periods are of variable length, generally lasting tens of millions of years, with characterist...Stone Age
(Encyclopedia)Stone Age: see Paleolithic period; Mesolithic period; Neolithic period. ...Five Dynasties and Ten Kingdoms
(Encyclopedia)Five Dynasties and Ten Kingdoms, period of Chinese history between the fall of the T'ang dynasty (a.d. 907) and the establishment of the Sung dynasty (a.d. 960). It is named for the five successive sh...Six Dynasties
(Encyclopedia)Six Dynasties, period of Chinese history between the fall of the Han dynasty (a.d. 220) and the unification of China under the Sui dynasty (a.d. 589). It is named for the six successive dynasties that...Natufian
(Encyclopedia)Natufian: see Neolithic period; Mesolithic period. ...porcelain
(Encyclopedia)porcelain [Ital. porcellana], white, hard, permanent, nonporous pottery having translucence which is resonant when struck. Porcelain was first made by the Chinese to withstand the great heat generated...adolescence
(Encyclopedia)adolescence, time of life from onset of puberty to full adulthood. The exact period of adolescence, which varies from person to person, falls approximately between the ages 12 and 20 and encompasses b...dog days
(Encyclopedia)dog days, name for the most sultry period of summer, from about July 3 to Aug. 11. Named in early times by observers in countries bordering the Mediterranean, the period was reckoned as extending from...Kish, ancient city, Mesopotamia
(Encyclopedia)Kish kĭsh [key], ancient city of Mesopotamia, in the Euphrates valley, 8 mi (12.9 km) E of Babylon and 12 mi (19 km) east of the modern city of Hillah, Iraq. It was occupied from very ancient times, ...Atlas, in astronomy
(Encyclopedia)Atlas, in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XV (or S15), Atlas is a small, irregularly shaped (nonspherical) body measuring about 25 mi (40 km) ...Browse by Subject
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