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NATIONAL PARKS

Name, location, and year authorized Acreage Outstanding characteristicsAcadia (Maine), 1919 47,548.94Rugged seashore on Mt. Desert Island and adjacent mainlandArches (Utah), 1971 76,518.98…

The Grand Canyon: Facts, History & Profile

Top of Page Image Source: Getty ImagesFast Grand Canyon Facts Length: 277 miles (446 km) Width: 18 miles (29 km) at widest point Depth: 1 mile (1.6 km) deep Age: Estimated to be between 5-6…

rock

(Encyclopedia) rock, aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided,…

Africa

(Encyclopedia) CE5 AfricaAfricaăfˈrĭkə [key], second largest continent (2015 est. pop. 1,194,370,000), c.11,677,240 sq mi (30,244,050 sq km) including adjacent islands. Broad to the north (c.4,600…

Antarctica

(Encyclopedia) CE5 AntarcticaAntarcticaăntärkˈtĭkə, –ärˈtĭkə [key], the fifth largest continent, c.5,500,000 sq mi (14,245,000 sq km), asymmetrically centered on the South Pole and almost entirely…

United States

(Encyclopedia) CE5 CE5 CE5 United States, officially United States of America, republic (2015 est. pop. 319,929,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the…