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rhyolite

(Encyclopedia)rhyolite, fine-grained light-colored acidic volcanic rock. Rhyolite is chemically the equivalent of granite, and is thus composed primarily of quartz and orthoclase feldspar with subordinate amounts o...

Little Bighorn Battlefield National Monument

(Encyclopedia)Little Bighorn Battlefield National Monument: see Little Bighorn, river; National Parks and Monuments (table). ...

Grand Canyon–Parashant National Monument

(Encyclopedia)Grand Canyon–Parashant National Monument: see Grand Canyon; National Parks and Monuments (table). ...

Saint Helens, Mount

(Encyclopedia)Saint Helens, Mount, volcanic peak, 8,363 ft (2,549 m; 9,677 ft/2,950 m before its 1980 eruption) high, SW Wash., historically the most active volcano in the Cascade Range. Dormant since 1857, Mt. St....

Ireland, National University of

(Encyclopedia)Ireland, National University of, founded 1908 to provide higher education for Irish Roman Catholics. It consists of three colleges: University College, Galway; University College, Cork; and University...

Federal National Mortgage Association

(Encyclopedia)Federal National Mortgage Association (FMNA), commonly known as Fannie Mae, government-sponsored enterprise that is the largest purchaser and guarantor of home mortgages in the country. Headquartered ...

National Museum of Anthropology

(Encyclopedia)National Museum of Anthropology, Mexico City. The present building, designed by Pedro Ramírez Vázquez and inspired by ancient Mexican architecture, was opened in 1964 and houses choice and extensive...

Lawrence Berkeley National Laboratory

(Encyclopedia)Lawrence Berkeley National Laboratory and Lawrence Livermore National Laboratory, scientific research centers run by the Univ. of California, located in Berkeley, Calif., and Livermore, Calif., respec...

Punchbowl

(Encyclopedia)Punchbowl, hill, 500 ft (152 m) high, in the city of Honolulu, SE Oahu island, Hawaii. In the bowllike extinct volcanic crater at the summit (reached by a scenic drive) is the National Memorial Cemete...

Reelfoot Lake

(Encyclopedia)Reelfoot Lake, 20 mi (32 km) long, NW Tenn., near the Mississippi River; designated a national natural landmark by the National Park Service. It was formed when a depression created by earthquakes in ...