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sand

(Encyclopedia) sand, rock material occurring in the form of loose, rounded or angular grains, varying in size from .06 mm to 2 mm in diameter, the particles being smaller than those of gravel and…

Ordovician period

(Encyclopedia) Ordovician periodOrdovician periodôrdəvĭshˈən [key] [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale,…

joint, in geology

(Encyclopedia) joint, in geology, fracture in rocks along which no appreciable movement has occurred (see fault). Nearly vertical, or sheet, joints that result from shrinkage during cooling are…

Acoma

(Encyclopedia) Acoma or Ácoma Ácoma both: ăkˈəmə [key], pueblo, alt. c.7,000 ft (2,130 m), Valencia co., W central N.Mex.; founded c.1100–1250. This “sky city” atop…

Helgoland

(Encyclopedia) Helgoland Helgoland hĕlˈgōläntˌ [key] or Heligoland Helgoland…

The Journals of Lewis & Clark: May 31, 1805

by Meriwether Lewis and William Clark May 30, 1805June 1, 1805May 31, 1805 Friday May 31st 1805. This morning we proceeded at an early hour with the two perogues leaving the canoes…

Jura, mountain range, France and Switzerland

(Encyclopedia) JuraJuraj&oobreve;rˈə, Fr. zhüräˈ, Ger. y&oomacr;ˈrä [key], mountain range, part of the Alpine system, E France and NW Switzerland, occupying parts of the French region of…

North Yorkshire

(Encyclopedia) North Yorkshire, county (2011 pop. 598,376), 3,209 sq mi (8,313 sq km), N England. The county comprises the districts of Craven, Hambleton, Harrogate, Richmondshire, Ryedale,…