Groundwater pollution can be reduced by introduction of microorganisms that may break down some of the wastes.
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Q36: Dredging of a lake bottom
A) May be
Q37: A factory illegally dumps arsenic-rich wastewater into
Q38: Biochemical oxygen demand is the amount of
Q39: Eutrophication of water is accelerated by
A) Increased
Q40: Concern about environmental pollution is such that
Q42: An oxygen sag curve describes how oxygen
Q43: Mercury is so toxic in all its
Q44: If ground water is contaminated with petroleum
Q45: Chemical decontamination is principally used for small
Q46: Groundwater pollution is most often and most
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