What valuable commodity has yet to be commercially mined from ocean sediments?
a. Natural gas
b. Gravel
c. Diatomaceous earth
d. Manganese nodules
ANS: D
Manganese nodules have yet to be commercially mined due to their low market value. As techniques
for deep-sea mining become more advance and raw material prices increase, however, the nodules'
concentration of valuable materials will almost certainly be exploited. Information can be found in the
section Marine Sediments Are Economically Important.
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