Mercury is so toxic in all its forms that it is no longer used except as a poison,as in fungicides.
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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
Q41: Groundwater pollution can be reduced by introduction
Q42: An oxygen sag curve describes how oxygen
Q44: If ground water is contaminated with petroleum
Q45: Chemical decontamination is principally used for small
Q46: Groundwater pollution is most often and most
Q47: After the dangers of DDT were recognized,use
Q48: Pollution of surface water has nothing to
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