Acid rain is rain that is more acidic than normal. Acid rain is a complicated problem. Primarily caused by air pollution, acid rain's spread and damage involves weather, chemistry, soil, and the life cycles of plants and animals on the land and in lakes and streams. This form of air pollution is currently a subject of great controversy because of its worldwide environmental damages. For the last ten years, this problem has brought destruction to thousands of lakes and streams in the United States, Canada, and parts of Europe.
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