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Samoa, island chain, SW Pacific Ocean

(Encyclopedia)Samoa, chain of volcanic islands in the South Pacific, comprising the independent nation of Samoa (formerly Western Samoa), and E of long. 171° W, the islands of American Samoa, under U.S. control. T...

seafloor spreading

(Encyclopedia)CE5 Schematic model of the oceanic crust, showing seafloor spreading seafloor spreading, theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwate...

sea

(Encyclopedia)sea, term used as synonymous with ocean, or a subdivision of an ocean (Caribbean Sea, Yellow Sea), or erroneously designating a large salt lake (Caspian Sea, Dead Sea, Aral Sea). ...

gyre

(Encyclopedia)gyre: see ocean.

trench

(Encyclopedia)trench: see ocean.

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