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Chlorophyta

(Encyclopedia)Chlorophyta klōrŏfˈətə [key], phylum (division) of the kingdom Protista consisting of the photosynthetic organisms commonly known as green algae. The organisms are largely aquatic or marine. The ...

concretion

(Encyclopedia)concretion, mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the pore spaces of the...

Leakey, Louis Seymour Bazett

(Encyclopedia)Leakey, Louis Seymour Bazett băzˈət, lēˈkē [key], 1903–72, British archaeologist and anthropologist of E Africa, b. Kabete, Kenya; father of Richard Leakey. His fossil discoveries in E Africa ...

geologic timescale

(Encyclopedia)CE5 geologic timescale, a chronological scale of earth's history used to measure the relative or absolute age of any part of geologic time. Of the numerous timescales, the most common is based on g...

Apatosaurus

(Encyclopedia)Apatosaurus ăpˌətəsôrˈəs, āˌpătˌə– [key], [Gr.,=deceptive lizard], quadruped saurischian dinosaur, estimated to be from 70 to 90 ft (21 to 27 m) in length and to weigh up to 30 tons (27 ...

Cope, Edward Drinker

(Encyclopedia)Cope, Edward Drinker, 1840–97, American paleontologist and comparative anatomist, b. Philadelphia, studied at the Academy of Natural Sciences, Philadelphia, and at the Smithsonian Institution. His l...

cladistics

(Encyclopedia)cladistics fīˌlōjənĕtˈĭk [key], an approach to the classification of living things in which organisms are defined and grouped by the possession of one or more shared characteristics (called cha...

Charles II, emperor of the West and king of the West Franks

(Encyclopedia)Charles II or Charles the Bald, 823–77, emperor of the West (875–77) and king of the West Franks (843–77); son of Emperor Louis I by a second marriage. The efforts of Louis to create a kingdom f...

Declaration of the Rights of Man and Citizen

(Encyclopedia)Declaration of the Rights of Man and Citizen, a fundamental document of French constitutional history, drafted by Emmanuel Sieyès, adopted by the Constituent Assembly on Aug. 26, 1789, and embodied i...

Wolcott, Oliver, signer of the Declaration of Independence

(Encyclopedia)Wolcott, Oliver, 1726–97, political leader in the American Revolution, signer of the Declaration of Independence, b. South Windsor (then in Windsor), Conn.; son of Roger Wolcott. He fought in King G...