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Pollution
Pollution is the contamination of soil, water or the atmosphere by
harmful substances.
Chemicals used to kill insects and weeds can build up and damage the
soil.
Sewage, waste from factories and oil from tankers pollute rivers and
oceans.
Smoke from chimneys and fumes from cars polluter the air.
Pollution car threaten our health, and even make it impossible for
plants and animals to live. |