Industrial or man-made concentrations of naturally occurring substances, such as_____ and _____ have also been identified as health hazards in soil and groundwater.
A
Carbon and ammonia
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B
Ammonia and nitrates
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C
Oxides and ammonia
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D
Carbon and nitrates
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Solution
The correct option is B Ammonia and nitrates Industrial or man-made concentrations of naturally occurring substances, such as nitrate and ammonia associated with livestock manure from agricultural operations, have also been identified as health hazards in soil and groundwater.