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Belle Isle, Strait of
(Encyclopedia) Belle Isle, Strait ofBelle Isle, Strait ofbĕlīlˈ [key], c.35 mi (60 km) long and from 10 to 15 mi (16–24 km) wide, between the island of Newfoundland and Labrador-Ungava peninsula,…quarrying
(Encyclopedia) quarrying, open, or surface, excavation of rock used for various purposes, including construction, ornamentation, road building, and as an industrial raw material. Rock that has been…Baltic Shield
(Encyclopedia) Baltic Shield, the continental core of Europe, composed of Precambrian crystalline rock, the oldest of Europe. The tectonically stable region was not affected by the Caledonian,…syenite
(Encyclopedia) syenitesyenitesīˈənīt [key], coarse-grained igneous rock, similar in appearance and composition to granite. Unlike granite, it contains little or no quartz. The chief minerals in…cassiterite
(Encyclopedia) cassiteritecassiteritekəsĭtˈərīt [key], heavy, brown-to-black mineral, tin oxide, SnO2, crystallizing in the tetragonal system. It is found as short prismatic crystals and as irregular…erosion
(Encyclopedia) erosionerosionĭrōˈzhən [key], general term for the processes by which the surface of the earth is constantly being worn away. The principal agents are gravity, running water, near-…aureole, in physics
(Encyclopedia) aureoleaureoleôrˈēōlˌ [key], in physics, luminous circle seen when the sun or other bright light is observed through a diffuse medium, i.e., smoke, thin cloud, fog, haze, or mist. It…mantle
(Encyclopedia) mantle, portion of the earth's interior lying beneath the crust and above the core. No direct observation of the mantle, or its upper boundary, has been made; its boundaries have been…Guiana Highlands
(Encyclopedia) Guiana Highlands, mountainous tableland, c.1,200 mi (1,930 km) long and from 200 to 600 mi (322–966 km) wide, N South America, bounded by the Orinoco and Amazon river basins, and by…Black Canyon of the Gunnison National Park
(Encyclopedia) Black Canyon of the Gunnison National Park, 30,300 acres (12,272 hectares), W central Colorado, in the Rocky Mts. The park embraces the most spectacular stretch of the 53-mi (85-km)…Trending
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