Water pollution: fertilisers/sewage enter water, mineral ions are absorbed by plants/algae, Plants/algae grow + reproduce, Plants/algae die, Decomposers (bacteria) respire, Oxygen levels in water fall, Fish etc die due to a lack of O2, It's called eutrophication!, Air pollution: Fossil fuels are burnt, Sulphur dioxide is released, Sulphur dioxide reacts with water in clouds, acid rain falls , Acid rain damages leaves, acidifies lakes killing fish,

Water pollution vs Air pollution

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