Tuesday, April 05, 2005

Mountain, Heating and thermal expansion

Rocks, like most materials, expand when they are heated. Some mountain ranges and plateaus are high simply because the crust and upper mantle beneath them are unusually hot. Most broad variations in the topography of the ocean floor, the mid-ocean ridges and rises, are due to horizontal variations in temperature in the outer 100 kilometres of the Earth. Hot areas stand

Friday, March 18, 2005

World War I, The Western Front, June–December 1917

Pétain's decision to remain temporarily on the defensive after Nivelle's failure gave Haig the opportunity to fulfill his desire for a British offensive in Flanders. He took the first step on June 7, 1917, with a long-prepared attack on the Messines Ridge, north of Armentières, on the southern flank of his Ypres salient. This attack by General Sir Herbert Plumer's 2nd Army proved

Wednesday, March 16, 2005

Uccello, Paolo

Original name  Paolo Di Dono   Florentine painter whose work attempted uniquely to reconcile two distinct artistic styles—the essentially decorative late Gothic and the new heroic style of the early Renaissance. Probably his most famous paintings are three panels representing “The Battle of San Romano” (c. 1456). His careful and sophisticated perspective

Monday, March 14, 2005

Banner System

Chinese  (Wade–Giles romanization) Ch'i-ping,  Pinyin  Qibing,   the military organization used by the Manchu tribes of Manchuria (now Northeast China) to conquer and control China in the 17th century. The Banner system was developed by the Manchu leader Nurhachi (1559–1626), who in 1601 organized his warriors into four companies of 300 men each. The companies were distinguished by banners of different colours—yellow, red, white, and blue. In 1615 four more

Saturday, March 12, 2005


Also spelled  Meerkat,   common name for certain carnivores of the civet family (Viverridae): the suricate (q.v.) and various mongoose (q.v.) species.

Thursday, March 10, 2005

Río Gallegos

Founded in 1885, it was named for Blasco Gallegos, one of Ferdinand Magellan's pilots, who is credited with discovering the river. Prehistoric cave paintings

Wednesday, March 09, 2005


Town, west-central Guinea. Located on the Conakry-Kankan railway and at the intersection of roads from Kindia, Dalaba, Dabola, and Faranah, Mamou was founded in 1908 as a collecting point on the railroad from Conakry (125 miles [201 km] southwest). It is the chief trading centre for the rice, cattle, citrus fruits, bananas, tomatoes, and mangoes raised in the surrounding agricultural area.