mean sea level
31Sea surface height — (SSH) is the height (or topography or relief) of the ocean s surface. On a daily basis, SSH is most obviously affected by the tidal forces of the Moon and the Sun acting on the Earth. Over longer timescales, SSH is influenced by both the Earth s… …
32Sea surface temperature — Weekly average sea surface temperature for the World Ocean during the first week of February 2011, during a period of La Niña …
33sea — n. 1 the expanse of salt water that covers most of the earth s surface and surrounds its land masses. 2 any part of this as opposed to land or fresh water. 3 a particular (usu. named) tract of salt water partly or wholly enclosed by land (the… …
34level — [[t]le̱v(ə)l[/t]] ♦ levels, levelling, levelled (in AM, use leveling, leveled) 1) N COUNT: with supp A level is a point on a scale, for example a scale of amount, quality, or difficulty. If you don t know your cholesterol level, it s a good idea… …
35sea ice — Ice formed from frozen seawater in polar regions. Most sea ice occurs as pack ice, which drifts across the ocean surface; other types of sea ice include fast ice, which is attached to coasts and sometimes the seafloor or between grounded icebergs …
36mean high tide — The average height of all the high waters at a place over a considerable period of time. A line, to be determined by taking an average of the rise of the water above sea level for a period of 18.6 years, that fixes the boundary between tideland… …
37mean spheroid — noun : an imaginary spheroid which is commonly assumed to be an ellipsoid of revolution but may have three unequal axes, which coincides most nearly with the actual figure of the earth at the plane of sea level, and to which trigonometrical… …
38North Sea flood of 1953 — 1953 North Sea flood Aftermath of the flood in Oude Tonge, Goeree Overflakkee, Netherlands …
39Flight level — A Flight Level (FL) is a standard nominal altitude of an aircraft, in hundreds of feet. This altitude is calculated from a world wide fixed pressure datum of 1013.25 hPa (29.921 inHg), the average sea level pressure, and therefore is not… …
40Red Sea — The Red Sea is a salt water inlet of the Indian Ocean between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb sound and the Gulf of Aden. In the north are the Sinai Peninsula, the Gulf of Aqaba, and the Gulf …
