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Geology of the Grand Canyon: Weathering.

CORRASION.WEATHERING.The work of corrasion is limited to the cutting of narrow gashes in the strata, and the grinding up of the fragments brought into the river channels. The widening of…

Geology of the Grand Canyon: The Trias.

THE JURASSIC.THE VERMILION CLIFFS.THE TRIAS.Kanab village is situated under the eaves of the Vermillion Cliffs, in the jaws of the cañon of Kanab Creek. It has for several years been the…

Geology of the Grand Canyon: The Jurassic.

THE CRETACEOUS.THE TRIAS.THE JURASSIC.Beyond the Cretaceous, as we descend the stairway of terraces, the Jurassic comes to daylight. It forms a belt encircling the Cretaceous and outside of…

Geology of the Grand Canyon: The Cretaceous.

THE EOCENE.THE JURASSIC.THE CRETACEOUS.The platform immediately below the Pink Cliffs is picturesque rather than grand. Rough rolling ridges of yellow sandstone, long sloping hillsides and…

Idfu

(Encyclopedia) IdfuIdfuĭdˈf&oomacr; [key] or EdfuIdfuĕdˈ– [key], town (1986 pop. 45,737), S central Egypt, on the Nile River. It is an agricultural trade center and has paper mills and a sugar…

Vindhya Range

(Encyclopedia) Vindhya RangeVindhya Rangevĭnˈdyə [key], chain of hills, c.600 mi (970 km) long, rising to c.3,000 ft (910 m), Madhya Pradesh state, central India. The Vindhya Range has been the…

grinding

(Encyclopedia) grinding, process by which surface material is removed from an object, usually metal, by the abrasive action of a rotating wheel or a moving belt that contains abrasive grains. A…

Sioux Falls

(Encyclopedia) Sioux Falls, city (1990 pop. 100,814), seat of Minnehaha co., SE S.Dak., on the Big Sioux River; settled 1856, inc. as a village 1877, as a city 1883. Settlers abandoned the site in…

Nafud

(Encyclopedia) NafudNafudnäf&oomacr;dˈ [key] or NefudNefudnĕf&oomacr;dˈ [key], desert area in the northern part of the Arabian peninsula, occupying a great oval depression; 180 mi (290 km)…

Carboniferous period

(Encyclopedia) Carboniferous periodCarboniferous periodkärbənĭfˈərəs [key], fifth period of the Paleozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), from 350 to…