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Major Ridges and Trenches of the Seafloor

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Major  Ridges and Trenches  of the Seafloor
  (a) Post World War II mapping revealed that  the seafloor contains features such as ridges (mountain chains)  and deep trenches.  (b) A computer- generated map of part  of the East Pacific Rise,  a mid-ocean ridge.  Red = highest elevations, blue = lowest.
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