the treatment of alluvial tin is not
21South America — South American. a continent in the S part of the Western Hemisphere. 271,000,000; ab. 6,900,000 sq. mi. (17,871,000 sq. km). * * * Continent, Western Hemisphere. The world s fourth largest continent, it is bounded by the Caribbean Sea to the… …
22United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
23technology, history of — Introduction the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …
24congo — /kong goh/, n. congou. * * * Congo Congo:Geography Location: Western Africa, bordering the South Atlantic Ocean, between Angola and Gabon Map references: Africa Area: total area: 342,000 sq km land area: 341,500 sq km comparative area: slightly… …
25Congo — /kong goh/, n. 1. People s Republic of the, a republic in central Africa, W of the Democratic Republic of the Congo: formerly an overseas territory in French Equatorial Africa; now an independent member of the French Community. 2,583,198; 132,046 …
26Platinum — This article is about the chemical element. For other uses, see Platinum (disambiguation). iridium ← platinum → gold Pd ↑ Pt ↓ Ds …
27Somalia — Somalian, adj., n. /soh mah lee euh, mahl yeuh/, n. an independent republic on the E coast of Africa, formed from the former British Somaliland and the former Italian Somaliland. 9,940,232; 246,198 sq. mi. (637,653 sq. km). Cap.: Mogadishu.… …
28Dominican Republic — a republic in the West Indies, occupying the E part of the island of Hispaniola. 8,228,151; 19,129 sq. mi. (49,545 sq. km). Cap.: Santo Domingo. Formerly, Santo Domingo, San Domingo. * * * Dominican Republic Introduction Dominican Republic… …
29geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …
30metalwork — metalworker, n. /met l werrk /, n. objects made of metal. [1840 50; METAL + WORK] * * * Useful and decorative objects fashioned of various metals. The oldest technique is hammering. After с 2500 BC, casting was also used, molten metal being… …
