(Encyclopedia) Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying…
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A. Diagram of wave: Wave travels one wavelength during one period
B. Diagram of wave: Phase relationships
wave, in oceanography, an oscillating movement up and down, of a body…
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West Indies, archipelago, between North and South America, curving c.2,500 mi (4,020 km) from Florida to the coast of Venezuela and separating the Caribbean Sea and the Gulf of…
(Encyclopedia) mountain, high land mass projecting conspicuously above its surroundings and usually of limited width at its summit. Although isolated mountains are not unusual, mountains commonly…
(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,…
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AlaskaAlaskaəlăˈskə [key], largest in area of the United States but one of the smallest in population, occupying the northwest extremity of the North American continent,…
(Encyclopedia) geology, science of the earth's history, composition, and structure, and the associated processes. It draws upon chemistry, biology, physics, astronomy, and mathematics (notably…
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Iceland, Icel. Ísland, officially Republic of Iceland, republic (2015 est. pop. 330,000), 39,698 sq mi (102,819 sq km), the westernmost state of Europe, occupying an island in…
