(Encyclopedia) tide, alternate and regular rise and fall of sea level in oceans and other large bodies of water. These changes are caused by the gravitational attraction of the moon and, to a lesser…
(Encyclopedia) longitudelongitudelŏnˈjĭt&oomacr;dˌ [key], angular distance on the earth's surface measured along any latitude line such as the equator east or west of the prime meridian. A…
(Encyclopedia) magnetic pole, the two roughly opposite ends of the planet where the earth's magnetic intensity is the greatest, as the north and south magnetic poles. For the magnetic north, it is…
(Encyclopedia) space science, body of scientific knowledge as it relates to space exploration; it is sometimes also called astronautics. Space science draws on the conventional sciences of physics,…
(Encyclopedia) asthenosphereasthenosphereăsthēnˈəsfēr [key], region in the upper mantle of the earth's interior, characterized by low-density, semiplastic (or partially molten) rock material…
(Encyclopedia) radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is…
(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…
