manganese nodule meaning

  "manganese nodule" in a sentence
noun
  A small irregular concretion, found on deep ocean-floor sediment, containing high concentrations of manganese and other metals

Examples

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  1. Manganese nodules are expected to exist in the Southern Ocean.
  2. It also is reported from deep sea manganese nodules.
  3. Land supplies turned out to be more plentiful and accessible than the manganese nodules.
  4. Attempts to find economically viable methods of harvesting manganese nodules were abandoned in the 1970s.
  5. This is especially true of manganese nodules.

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