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Because many of the minerals found on the ocean floor are still_____ on land, where mining is relatively inexpensive, mining the ocean floor has yet to become a_____enterprise.
Blank(i) Blank(ii)
A.scarce
B.unidentified
C.plentiful
D.marginal
E.profitable
F.subsidized
Blank(i) Blank(ii)
A.scarce
B.unidentified
C.plentiful
D.marginal
E.profitable
F.subsidized
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