abyssal zone africa american geographical society antarctic circumpolar current aphotic zone aral sea archipelago arctic ocean atlantic ocean atmosphere of venus avalonia baltica basalt bathyal zone bathyscaphe trieste bay bioluminescence black sea bosporus bridge river ocean canal caspian sea celestial ocean cephalopod cetacea challenger deep color of water continent continental drift crustacean dolphin earth earthdive equator extraterrestrial liquid water fish fishing industry freshwater geology of venus geyser gibraltar gondwana great salt lake greek language greek mythology greenhouse effect hadal zone headlands and bays hindu mythology hydrosphere iapetus ocean indian ocean insular islands intermontane islands international maritime organization khanty ocean krill laurasia littoral zone lobster marginal sea marine biology marine debris marine snow marine worm mars exploration rover mediterranean sea mesopelagic mesopotamian mythology mirovia neritic zone norse mythology north north america northern mariana islands ocean acidification ocean current ocean exploration oceanography octopus pacific ocean paleo-tethys ocean pan-african ocean panama canal pangaea pannotia panthalassa pelagic zone photic zone planet plankton plate tectonics porpoise proto-tethys ocean radiata rheic ocean rodinia saint lawrence seaway salinity salt lake samudra sea sea level sea salt sea state seawater seven seas ship ship canal shrimp siberia slide mountain ocean south southern ocean square kilometre strait of gibraltar suez canal superocean surface tethys ocean thermocline tropical cyclone ural ocean varuna water weather whale wiktionary woods hole oceanographic institution world ocean world ocean day