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12 questions from this quiz
H2OH_2OH2O
Ions and gases
Mg2+Mg^{2+}Mg2+, Ca2+Ca^{2+}Ca2+, Na+Na^+Na+
Oxygen and carbon dioxide
It lowers the pH of water
Bacteria and viruses
Fertilisers and pesticides
150 litres
Underground storage, rivers, reservoirs
Dry conditions with insufficient rain
When demand exceeds supply
Take showers instead of baths
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