Manganese nodules .
A) are a type of cosmogenous sediment
B) are almost exclusively found on continental shelves
C) "grow" very slowly, at an average rate of 1 to 10 millimeters per million years
D) are inexpensive to collect and are, therefore, widely exploited

Question

Quizplus · Accepted Answer

Manganese nodules grow very slowly, at an average rate of 1 to 10 millimeters per million years. They are not cosmogenous sediments, are found on the deep ocean floor rather than continental shelves, and are expensive to collect, which limits their exploitation.

Manganese Nodules