Sunil was reading about life in ancient times, and how different minerals were discovered. Which of the following could have been in wide use after the invention of underwater vehicles?
A
Petroleum
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B
Coal
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C
Natural gas
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D
Manganese
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Solution
The correct option is D Manganese Some minerals like common salt, magnesium, and bromine can be extracted from ocean waters. In fact, ocean beds are an excellent source of manganese nodules. After the invention of underwater vehicles and instruments, procurement of manganese would have become easier and it would have been in wide use.