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Diyarbakir

(Encyclopedia) Diyarbakir Diyarbakir dēyärˈbäkŭrˌ [key], anc. Amida, city, capital of Diyarbakir prov., SE…

Shield Volcanoes

Shield volcanoes are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping…

porphyry, igneous rock

(Encyclopedia) porphyryporphyrypôrˈfərē [key], igneous rock composed of large, conspicuous crystals (phenocrysts) and a groundmass in which the phenocrysts are embedded. Some authorities consider the…

gravel

(Encyclopedia) gravel, particles of rock, i.e., stones and pebbles, usually round in form and intermediate in size between sand grains and boulders. Gravel is composed of various kinds of rock, the…

sandstone

(Encyclopedia) sandstone, sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness…

Zambezi

(Encyclopedia) ZambeziZambezizămbēˈzē [key], river, c.1,700 mi (2,740 km) long, rising in NW Zambia, S central Africa, and flowing in an S-shaped course generally E through E Angola, along the Zambia…

Madeira Islands

(Encyclopedia) Madeira IslandsMadeira Islandsmədērˈə, –dârˈə [key], archipelago (1991 pop. 257,692), 308 sq mi (798 sq km), autonomous region of Portugal, in the Atlantic Ocean c.350 mi (560 km) off…

Interesting Caves and Caverns of the World

The following list names interesting caves and caverns of the world, including Aggtelek in Hungary, Blue Grotto in Italy, Kent's Cavern in England, Mammoth Cave in Kentucky, Wind Cave in South…