Important Manganese

Some articles on manganese:

Manganese Compounds - Occurrence and Production
... See also CategoryManganese minerals Manganese makes up about 1000 ppm (0.1%) of the Earth's crust, making it the 12th most abundant element there ... Soil contains 7–9000 ppm of manganese with an average of 440 ppm ... Seawater has only 10 ppm manganese and the atmosphere contains 0.01 µg/m3 ...

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