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9 January, 10:46

Manganese nodules are

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  1. 9 January, 14:02
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    Rock concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. The core may be microscopically small and is sometimes completely transformed intomanganese minerals by crystallization.

    (Also known as Polymetallic nodules)
  2. 9 January, 14:12
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    An example of Hydrogenous Sediments
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