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: Pollution can be in the [[water]] or in the [[air]].
: [[Factory|Factories]] often produce [[pollution]] that gets into the [[air]], including [[soot]] that can affect our [[breathing]] as well as [[Sulphur Dioxide]] and [[Nitrogen Oxide]]s which cause [[Acid Rain|acid rain]].
: [[Plastic (Material)|Plastic]] is currently considered a major [[pollution]] in the [[ocean]]s and is responsible for the deaths of countless [[animal]]s every year.
: [[Fertiliser]]s used on crops is a major source of [[pollution]] for [[river]]s and [[lake]]s and can cause [[eutrophication]].