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manganese nodule

noun

  1. geology a small irregular concretion found on deep ocean floors having high concentrations of certain metals, esp manganese
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Hydrothermal vents and manganese nodule fields in the deep oceans contain more biodiversity than expected.

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Interest in manganese nodule exploitation may have subsided since the 1970s but it never quite disappeared.

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The prospect of mining asteroids was a sci-fi dream of the 1970s, just around the time of the manganese nodule craze.

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The lure of the manganese nodule faded from public consciousness.

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A sediment core from the bottom of the ocean with a well-preserved sediment-water interface and a manganese nodule sitting on the sediment surface.

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