Acid rain is caused when the sulfur and nitrogen oxides in air pollution combine with atmospheric moisture to produce highly acidic precipitation. ... NOx forms from nitrogen impurities in fuels and from nitrogen in the air used for combustion. ... For example, many trees in central European forests have died; however, these forests have also been subjected to other forms of pollution, including ozone. ... In recent years, rainfall acidity in both North America and western Europe has declined in response to pollution control legislation. Since passage (1970) of the Clean Air Act, U.S. emission...

• Word Count: 632
• Approx Pages: 3
• Grade Level: Undergraduate

Agents of weathering are oxygen, air pollution, water, carbonic acid, and strong acids with water as the dominant agent. ... The rate of hydrolysis depends on the amount of H+ ions, which in turn depends on the composition of air and water in the soil, the activity of organisms, the presence of organic acids and the cation exchange. Oxidation occurs when rocks are exposed to oxygen in the air or water. ...

• Word Count: 953
• Approx Pages: 4
• Has Bibliography
• Grade Level: Undergraduate