Sea level

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Sea level

Sea level (pronunciation: /siː lɛvəl/) is the average level of the surface of one or more of Earth's oceans from which heights such as elevations may be measured. The term can also refer to the average level of the surface of the Earth's bodies of water.

Etymology

The term "sea level" is derived from the two English words "sea" and "level". "Sea" comes from the Old English word "sǣ", which has the same meaning. "Level" comes from the Old French word "nivel", which is derived from Latin "libella", a diminutive of "libra", meaning "balance".

Related terms

  • Elevation: The height above a given level, especially sea level.
  • Altitude: The height of an object or point in relation to sea level or ground level.
  • Ocean: A large body of salt water that covers most of the Earth's surface.
  • Tide: The alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.
  • Global warming: An increase in the Earth's average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect.
  • Climate change: A change in global or regional climate patterns, in particular a change apparent from the mid to late 20th century onwards and attributed largely to the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels.

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