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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