|
Polymetallic nodules, also called manganese nodules, are rock concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. The core may be microscopically small and is sometimes completely transformed into manganese minerals by crystallization. When visible to the naked eye, it can be a small test (shell) of a microfossil (radiolarian or foraminifer), a phosphatized shark tooth, basalt debris or even fragments of earlier nodules.
Proszę podzielić się swoimi pomysłami z nami.
Skontaktuj się z nami...
Wikiplacemarks.com
Android Apps
Placemarks
Login
Faq
Language