| 单词 | manganese nodule |
| 释义 | > as lemmasmanganese nodule manganese nodule n. Geology a small concretion consisting primarily of manganese and iron oxides, occurring in large quantities on the floors of oceans and the Great Lakes. ΘΚΠ the world > the earth > structure of the earth > constituent materials > stone > a stone > [noun] > concretionary or nodular > other nodules manganese nodule1876 1876 Proc. Royal Soc. 1875–6 24 507 The trawl brought up many manganese nodules or concretions and two shark's teeth; these nodules had in most cases a nucleus of pumice. 1912 J. Murray & J. Hjort Depths of Ocean iv. 157 Sulphate of barium has been found to be present in most marine deposits and in manganese nodules in small quantities. 1989 Encycl. Brit. XXV. 172/2 An estimated 1,500,000,000,000 tons of manganese nodules are on the Pacific Ocean floor alone. 2021 Frontiers in Marine Sci. 30 Mar. In the deep sea, proposed polymetallic nodule mining activities are likely to harm seafloor ecosystems, including unique habitats such as manganese nodules. < as lemmas |
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