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Pennsylvania
Pennsylvania , one of the Middle Atlantic states of the United States. It is bordered by New Jersey, across the Delaware River (E), Delaware (SE), Maryland (S), West Virginia (SW), Ohio (W), and Lake Erie and New York (N).
Facts and Figures
Area, 45,333 sq mi (117,412 sq km). Pop. (200...
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mystery
mystery or mystery story, literary genre in which the cause (or causes) of a mysterious happening, often a crime, is gradually revealed by the hero or heroine; this is accomplished through a mixture of intelligence, ingenuity, the logical interpretation of evidence, and sometimes sheer luck.
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Rocky Mountain goat
Rocky Mountain goat hoofed ruminant mammal, Oreamnos americanus, found in the high mountains of S Alaska, W Canada, and the extreme NW United States. Although it is not a true goat it belongs to the same family ( cattle family) and is goatlike in appearance, with a bearded chin, long face, and s...
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shock wave
shock wave wave formed of a zone of extremely high pressure within a fluid, especially the atmosphere, that propagates through the fluid at a speed in excess of the speed of sound. A shock wave is caused by the sudden, violent disturbance of a fluid, such as that created by a powerful explosion or ...
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papacy
papacy , office of the pope, head of the Roman Catholic Church. He is pope by reason of being bishop of Rome and thus, according to Roman Catholic belief, successor in the see of Rome (the Holy See) to its first bishop, St. Peter . The pope therefore claims to be the shepherd of all Christians and ...
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Antonio de Mendoza
Antonio de Mendoza , 1490?-1552, Spanish administrator, first viceroy of New Spain (1535-50) and viceroy of Peru (1551-52). Of noble family, Mendoza held high offices before going to Mexico, where his wise rule earned him the appellation "the good viceroy." He alleviated the condition of the ind...
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High Point
High Point city (1990 pop. 69,496), Davidson, Guilford, and Randolph counties, N N.C., in a heavily forested Piedmont region; settled before 1750, inc. 1859. It is a trade, industrial, and commercial center for an agricultural area. Noted for the production of furniture and hosiery, the city has be...
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petroleum
petroleum oily, flammable liquid that occurs naturally in deposits, usually beneath the surface of the earth; it is also called crude oil. It consists principally of a mixture of hydrocarbons , with traces of various nitrogenous and sulfurous compounds.
Origin and Natural Occurrence
Duri...
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West Point
West Point U.S. military post, since 1802 seat of the United States Military Academy . On the high west bank of the Hudson River N of New York City, West Point was the site of Revolutionary forts guarding the Hudson. Constitution Island, in the river, is also in the reservation. The plan of Benedi...
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insulation
insulation , use of materials or devices to inhibit or prevent the conduction of heat or of electricity. Common heat insulators are, fur, feathers, fiberglass, cellulose fibers, stone, wood, and wool; all are poor conductors of heat. The use of asbestos , formerly a common insulating material, ha...
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