manganese nodule

English

Noun

manganese nodule (plural manganese nodules)

  1. (geology) A concretion of oxides of manganese and iron found on the seafloor.
    • 1977 The most likely locations for early commercial mining of these seabed resources will be the Pacific Basin where there is a heavy concentration of manganese nodule sites at depths of between 12,500 feet and 17,500 feet. The Times - May 26, 1977 pg 27 col D
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