a small concretion consisting primarily of manganese and iron oxides, occurring in large quantities on the floors of oceans and the Great Lakes.
| 单词 | θ5840 |
| 释义 | the world > the earth > structure of the earth > constituent materials > stone > a stone > [noun] > concretionary or nodular > other nodules (1) manganese nodule1876 a small concretion consisting primarily of manganese and iron oxides, occurring in large quantities on the floors of oceans and the Great Lakes. |
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