CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Manganese nodules. View of manganese nodules from the ocean floor. Manganese nodules form when manganese and iron minerals are deposited on the surface of an object such as tiny pieces of animal skeleton. The minerals in the sea water deposit over a long time, so that a nodule grows by one centimetre in diameter in about a million years. Some ocean fields of nodules may one day be mined commercially.
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