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13 questions from this quiz
Harmful bacteria & nitrogen compounds
Depletes oxygen & promotes algae growth
Toxic metal compounds
Algal blooms & loss of biodiversity
Remove large particles & debris
Solid waste that settles at the bottom
Liquid on top with dissolved pollutants
Layers of sand & gravel
Absence of oxygen
Biogas as renewable energy
Bacteria that require oxygen
Kill bacteria & make water safe to drink
Manages water resources in scarce areas
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