The ______________ content of these nodules found on the marine floor makes them particularly attractive to industrial nations lacking offshore sources of these crucial materials.

The ______________ content of these nodules found on the marine floor makes them particularly attractive to industrial nations lacking offshore sources of these crucial materials.

The ______________ content of these nodules found on the marine floor makes them particularly attractive to industrial nations lacking offshore sources of these crucial materials.











a) Iron
b) Manganese
c) Copper
d) Nickel
e) All of above
















Answer: E