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UNIT 8 Ecosystems III: ecological balance Acid rain Biology and Geology 4. Secondary education UNIDAD UNIT 7 8 Acid rain 1 Industry, thermal power plants and vehicles emit polluting gases into the atmosphere (nitrogen and sulphur oxides) generated by the combustion of fossil fuels. 2 These oxides react with the water in the atmosphere and turn into nitric and sulphuric acid, which return to the Earth in the form of rain or snow with a high level of acidity. 3 The acid rain destroys the leaves of the trees and acidifies the soil, causing the death of forests and the destruction of lakes. In the cities, it contributes to stone sickness, which destroys limestone or marble monuments. 1 2 3 Biology and Geology 4. Secondary education