What is the water cycle and why is it important to freshwater resources?
- What is the water cycle and why is it important to freshwater resources?
- What should society learn from the case history of the Aral Sea?
- What are the major kinds of water pollutants and how do they degrade water quality?
- Why is untreated sewage such an important water pollutant to remediate?
- Why are people facing a crisis involving water pollution and how can we solve it?
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