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abundance abyssal acoustic animals Atlantic basic basins benthic benthos biomass bottom carbonate chemical coastal cobalt coccolithophorids concentrations continental shelf copepods copper cost crustaceans currents deep ocean deep water deepsea depth diatoms dinoflagellates distribution dredging economic effects elements environment environmental exploitation exploration factors ferromanganese ﬁg fish impact indicate iron larvae layer leaching major manganese nodules marine minerals marine mining material metals meters methods mineral deposits mining operations nekton nickel North nutrients occur ocean floor offshore oozes organisms oxides Pacific Pacific Ocean pelagic sediments phytoplankton plankton platforms potential present production provinces radiolarians range red clay regions samples sea floor sea water seabed selective leaching ship siliceous species substrate surface water survey temperature terrigenous transport tropical vertical world ocean zone zooplankton