(Encyclopedia) Harrison, William Henry, 1773–1841, 9th President of the United States (Mar. 4–Apr. 4, 1841), b. “Berkeley,” Charles City co., Va.; son of Benjamin Harrison (1726?–1791) and…
(Encyclopedia) sodium chloride, NaCl, common salt.
Salt is important in many ways. It is an essential part of the diet of both humans and animals and is a part of most animal fluids, such as…
(Encyclopedia) salamander, an amphibian of the order Urodela, or Caudata. Salamanders have tails and small, weak limbs; superficially they resemble the unrelated lizards (which are reptiles), but…
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Newfoundland and LabradorNewfoundland and Labradorny&oomacr;ˈfənlənd, ny&oomacr;fənlăndˈ; lăbˈrədôrˌ [key], province (2001 pop. 512,930), 156,185 sq mi (404,519 sq km),…
(Encyclopedia) Persian Gulf, arm of the Arabian Sea, 90,000 sq mi (233,100 sq km), between the Arabian peninsula and Iran, extending c.600 mi (970 km) from the Shatt al Arab delta to the Strait of…
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Compression system of refrigeration
refrigeration, process for drawing heat from substances to lower their temperature, often for purposes of preservation. Refrigeration in its…
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Worldwide pattern of earthquake activity: The dots indicate the epicenters of all earthquakes recorded during a recent 10-year period.
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earthquake, trembling or shaking…
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A. Side view of jet-propelled airplane B. Top view
airplane,&sp;aeroplane, or aircraft, heavier-than-air vehicle, mechanically driven and fitted with fixed wings that…
