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UFmanganese nodules
RTsedimentation
 ocean floors
 oceanography
 metal ores
 marine geology
 secondary structures
 sedimentary structures
 manganese composition
 concretions
 Law of the Sea
 ferromanganese composition
 MANOP
 phosphate composition
SNAs of 1981, restricted to nodules on the ocean floor, nodules within sediments in the ocean, and nodules in lakes. For nodules in non-sedimentary formations, use xenoliths. For nodules within sedimentary formations, such as chert nodules, use concretions.