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.
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Fossils-Facts-and-Finds
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Fossil collecting is a way to connect with the past. There’s something mysterious and powerful about holding a 400-million-year-old creature in the palm of your hand.
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Fossils-Facts-and-Finds
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Timeline showing the geological evolution of Earth, with brief explanations of each period
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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.
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Smithsonian Department of Paleobiology
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Information on the earths atmosphere. What types of gases are found in a pie chart.
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Earth
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An animated view of the Earth as it goes through each era with continental drift.
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Berkley
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