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Sioux

(Encyclopedia)Sioux or Dakota, confederation of Native North American tribes, the dominant group of the Hokan-Siouan linguistic stock, which is divided into several separate branches (see Native American languages)...

city planning

(Encyclopedia)city planning, process of planning for the improvement of urban centers in order to provide healthy and safe living conditions, efficient transport and communication, adequate public facilities, and a...

lead, chemical element

(Encyclopedia)lead, metallic chemical element; symbol Pb [Lat. plumbum]; at. no. 82; at. wt. 207.2; m.p. 327.502℃; b.p. about 1,740℃; sp. gr. 11.35 at 20℃; valence +2 or +4. One of the oldest metals used by h...

diving, deep-sea

(Encyclopedia)diving, deep-sea, act of descending into deep water, generally with some form of breathing apparatus, and remaining there for an extended period. It is used in fishing for sponges, coral, and pearls; ...

wave, in the earth sciences

(Encyclopedia)CE5 A. Diagram of wave: Wave travels one wavelength during one period B. Diagram of wave: Phase relationships wave, in oceanography, an oscillating movement up and down, of a body of water caused ...

socialism

(Encyclopedia)socialism, general term for the political and economic theory that advocates a system of collective or government ownership and management of the means of production and distribution of goods. Because...

Flanders

(Encyclopedia)Flanders flănˈdərz [key], former county in the Low Countries, extending along the North Sea and W of the Scheldt (Escaut) River. It is divided among East Flanders and West Flanders provs., Belgium;...

North Atlantic Treaty Organization

(Encyclopedia)North Atlantic Treaty Organization (NATO), established under the North Atlantic Treaty (Apr. 4, 1949) by Belgium, Canada, Denmark, France, Great Britain, Iceland, Italy, Luxembourg, the Netherlands, N...

magic, in entertainment

(Encyclopedia)magic, in entertainment, the seeming manipulation and supernatural control of the natural world for the amusement and amazement of an audience. Entertainment magic can be divided into four main catego...

Roman art

(Encyclopedia)Roman art, works of art produced in ancient Rome and its far-flung provinces. The continued striving after three-dimensional illusionist effects revealed in the various phases of painting was dup...