There is evidence that the composition of the earth's atmosphere is still changing. one possible reason is that many power stations generate electricity by burning fossil fuels such as coal, oil or natural gas. sulphur dioxide, SO2, is produced when coal burns in air. what environmental problem does sulphur dioxide cause?

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this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.