The word SEAMOUNT
MOST NEARLY means:
  1. the broad, flat portion of the deep- ocean basin
  2. an individual mountainof volcanic material on the abyssal plain
  3. pollution that comes from many sources and that cannot be traced to a specific site
  4. a layer of ocean water extending from 300m below sea level to about 700 m
  5. microscopic organisms that float at or near the ocean's surface
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