Burning fossil fuels, especially coal makes gases such as SO2 and NOx, SO2 and NOx are released into the air, SO2 and NOx mix with water vapour to make weak acids, The acid particles can travel long distances in the clouds, The acid rain can fall as dust, The acid rain can fall as rain, The acid rain can fall as snow, The lower pH can affect forests, The lower pH can affect the soil, The lower pH can affect waterways.

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