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metric system

(Encyclopedia)CE5 metric system, system of weights and measures planned in France and adopted there in 1799; it has since been adopted by most of the technologically developed countries of the world. It is based...

Pacific Ocean

(Encyclopedia)CE5 Pacific Ocean, largest and deepest ocean, c.70,000,000 sq mi (181,300,000 sq km), occupying about one third of the earth's surface; named by the explorer Ferdinand Magellan; the southern part i...

Sumatra

(Encyclopedia)Sumatra so͝omäˈtrə [key], island (1990 pop. 36,471,731), c.183,000 sq mi (473,970 sq km), Indonesia, in the Indian Ocean along the equator, S and W of the Malay Peninsula (from which it is separat...

orbit

(Encyclopedia)CE5 Important points in a planet's orbit as seen from the earth orbit, in astronomy, path in space described by a body revolving about a second body where the motion of the orbiting bodies is domi...

Twain, Mark

(Encyclopedia)Twain, Mark, pseud. of Samuel Langhorne Clemens, 1835–1910, American author, b. Florida, Mo. As humorist, narrator, and social observer, Twain is unsurpassed in American literature. His novel The Ad...

eclipse

(Encyclopedia)CE5 A. Lunar eclipse B. Solar eclipse eclipse ēklĭpsˈ, ĭ– [key] [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lu...

Nauru

(Encyclopedia)Nauru näo͞oˈro͞o [key], officially Republic of Nauru, atoll and independent republic (2015 est. pop. 11,000), c.8 sq mi (20 sq km), central Pacific, just south of the equator and west of the Gilbe...

gravitation

(Encyclopedia)gravitation, the attractive force existing between any two particles of matter. The term gravitygravity is commonly used synonymously with gravitation, but in correct usage a definite distinction is...

forest

(Encyclopedia)forest, a dense growth of trees, together with other plants, covering a large area of land. The science concerned with the study, preservation, and management of forests is forestry. A forest is an ec...

São Tomé and Principe

(Encyclopedia)CE5 São Tomé and Principe prēnˈsēpə [key], officially Democratic Republic of São Tomé and Principe, republic (2015 est. pop. 196,000), 372 sq mi (964 sq km), W Africa, in the Gulf of Guinea...