tide level gauge
51Ocean observations — The following are considered essential ocean climate variables by the OOPC[1][clarification needed] that are currently feasible with current observational systems. Contents 1 Ocean climate variables 1 …
52Maelstrom — For other uses, see Maelstrom (disambiguation). Saltstraumen maelstrom A maelstrom /ˈmeɪlstrɒm/ is a very powerful whirlpool; a large, swirling body of water. A free vortex, it has considerable downdraft. The power of tidal whirlpools tends to be …
53Sea surface temperature — Weekly average sea surface temperature for the World Ocean during the first week of February 2011, during a period of La Niña …
54Climate change in Tuvalu — Main article: Tuvalu Funafuti Climate change is of a concern in Tuvalu since at its highest, Tuvalu is only 4.5 m above sea level, and could be one of the first nations to experience the effects of sea level rise. Not only could parts of the …
55Tsunami — For other uses, see Tsunami (disambiguation) …
56Columbia Slough — Coordinates: 45°38′36″N 122°46′07″W / 45.64333°N 122.76861°W / 45.64333; 122.76861 …
57Columbia River — Coordinates: 46°14′39″N 124°3′29″W / 46.24417°N 124.05806°W / 46.24417; 124.05806 …
58Metres above the Adriatic — The Adriatic datum Metres above the Adriatic (German: Meter über Adria)[1] is an elevation reference system used in Austria and some other European countries based on the average water level of the Adriatic Sea at the Molo Sartorio in Triest… …
59Deep-ocean Assessment and Reporting of Tsunamis — A diagram of the Dart II System A tsunami b …
60Algeria — /al jear ee euh/, n. a republic in NW Africa: formerly comprised 13 departments of France; gained independence 1962. 29,830,370; 919,352 sq. mi. (2,381,122 sq. km). Cap.: Algiers. * * * Algeria Introduction Algeria Background: After a century of… …
