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7 Topic Pages Found in Marine Sciences and starting with the letter O
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All A B C D E F G H I J K L M N O P R S T U W
Open Ocean

interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major

Open Oil spills
Oil spills

Oil discharged from an ocean-going tanker, pipeline, or oil installation, often as a result of damage. An oil spill kills shore life, clogging the

Open Okhotsk, Sea of
Okhotsk, Sea of

Pacific Ocean E4 Area 600,000 square miles (1.6 million square km) Maximum depth 11,063 ft (3,372 m) Inflows Sea of Japan/East Sea; Amur,

Open Otters

name for a number of aquatic, carnivorous mammals of the weasel family, found on all continents except Australia. The common river otters of Eurasia

Open Overfishing

Fishing at rates that exceed the sustained-yield cropping of fish species, resulting in a net population decline. For example, in the North Atlantic,

Open Oxbow lake
Oxbow lake

Small lake located in a former meander loop of a river or stream channel. It is generally formed as a river cuts through a meander neck to shorten its


bivalve mollusk found in beds in shallow, warm waters of all oceans. The shell is made up of two valves, the upper one flat and the lower convex, with