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Unformatted text preview: the age of Earth. Relative Dating is just an estimate of the order of geological and prehistoric events by observing fossils and the way they are situated in the ground and by stratigraphic rules. 4. How old is the earth and what is the age based on? The age of Earth is estimated to be about 4.5 billion years old. This age was determined by using the radiometric age dating technique. What is a half life? The half life of an element is the time it takes for the item to decay to half of its initial amount....
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- Fall '08