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flint, mineral

(Encyclopedia)flint, variety of quartz that commonly occurs in rounded nodules and whose crystal structure is not visible to the naked eye. Flint is dark gray, smoky brown, or black in color; pale gray flint is cal...

George III, king of Great Britain and Ireland

(Encyclopedia)George III, 1738–1820, king of Great Britain and Ireland (1760–1820); son of Frederick Louis, prince of Wales, and grandson of George II, whom he succeeded. He was also elector (and later king) of...

Ruwenzori

(Encyclopedia)Ruwenzori ro͞oˌwənzōˈrē [key], mountain range, E central Africa, on the Uganda-Congo border, in the western arm of the Great Rift Valley between lakes Albert and Edward. This fault-block range i...

Cumberland Plateau

(Encyclopedia)Cumberland Plateau or Cumberland Mountains, southwestern division of the Appalachian Mt. system, extending northeast to southwest through parts of West Virginia, Virginia, Kentucky, and Tennessee into...

Black Hills

(Encyclopedia)Black Hills, rugged mountains, c.6,000 sq mi (15,540 sq km), enclosed by the Belle Fourche and Cheyenne rivers, SW S.Dak. and NE Wyo., and rising c.2,500 ft (760 m) above the surrounding Great Plains;...

Alphonsus Liguori, Saint

(Encyclopedia)Alphonsus Liguori, Saint ălfŏnˈsəs lĭgwôˈrē [key], 1696–1787, Italian churchman, Doctor of the Church. He was named Alfonso Maria de' Liguori. In 1732 he founded the Congregation of the Most...

Apennines

(Encyclopedia)Apennines ăpˈənīnz [key], Ital. Appennino, mountain system, running the entire length of the Italian peninsula. It extends south c.840 mi (1,350 km) from the Cadibona Pass in Liguria, NW Italy, wh...

Virunga

(Encyclopedia)Virunga vēro͝ongˈgä [key], volcanic range of mountains, E Congo, N Rwanda, and SW Uganda, central Africa, NE of Lake Kivu. It extends along the eastern rim of the Great Rift Valley and separates t...

Hindu Kush

(Encyclopedia)Hindu Kush hĭnˈdo͞o ko͝osh [key], a high mountain system, extending c.500 mi (800 km) W from the Pamir Knot, N Pakistan, into NE Afghanistan; rising to 25,236 ft (7,692 m) in Tirich Mir, on the bo...

Dasht-e Kavir

(Encyclopedia)Dasht-e Kavir däsht-ēkävērˈ [key], great salt desert, c.500 mi (800 km) long and c.200 mi (320 km) wide, SE of the Elburz Mts., N central Iran. It is a huge basin of interior drainage named after...