manganese nodule

British  

noun

1. geology a small irregular concretion found on deep ocean floors having high concentrations of certain metals, esp manganese

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Example Sentences

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

From Science Daily • Jan. 25, 2024

The sponges in question need to attach themselves to something hard on the sea floor, and in the depths of Pacific that often is a manganese nodule, a lump of rock containing some precious metals.

From Science Magazine • Dec. 20, 2016

During the morning a sounding realized two thousand two hundred and seventy fathoms and the sample of mud contained a small, black manganese nodule.

From The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 by Mawson, Douglas, Sir