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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+
It lowers the pH of water
Bacteria and viruses
Fertilisers, pesticides, industrial waste
For cooling machinery
150 litres
Underground storage, rivers, reservoirs
Insufficient rain to replenish supplies
When demand exceeds supply
Take showers instead of baths
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