Simply put, a fossil is the remains or evidence of any creature or plant that once lived on the Earth.
Now let's look at the long answer.
Fossils-Facts-and-Finds
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Timeline showing the geological evolution of Earth, with brief explanations of each period
The Geological Evolution of the Earth
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Excellent interactive tool for a review of of various geologic eras, as well as the formation and structure of the earth and it's atmosphere.
Smithsonian Department of Paleobiology
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Information on the earths atmosphere. What types of gases are found in a pie chart.
Earth
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An animated view of the Earth as it goes through each era with continental drift.
Berkley
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