What marine resource has been rendered uneconomical due to the cost of excavation?
A) Magnesium compounds
B) Manganese nodules
C) Sand and gravel
D) Salt

Question

Quizplus · Accepted Answer

There are different ways of mining manganese nodules. Unfortunately, none of the methods people have come up with have made it cost effective to mine these nodules. There may come a point in time when the mining of these nodules becomes economical. Information can be found in the section Physical Resources.

What Marine Resource Has Been Rendered Uneconomical Due to the Cost