What percent of sewage is treated in North America?
A) 90%
B) 75%
C) 50%
D) 25%
Correct Answer:
Verified
Q18: What is biochemical oxygen demand?
A)amount of oxygen
Q19: Eutrophication occurs when
A)nutrient increase causes excessive aquatic
Q20: The amount of oxygen required to decompose
Q21: Which of the following involves the removal
Q22: Which of the following best matches the
Q24: What two land uses result in substantial
Q25: Which of the following best matches the
Q26: The upper surface of an unconfined aquifer
Q27: The major consumptive use of water in
Q28: What two activities use the most water
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