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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
Bacteria and viruses
Fertilisers and pesticides
150 litres
For cooling machinery
To grow food
Insufficient rain to replenish supplies
When demand exceeds supply
Taking showers instead of baths
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