martes, 9 de noviembre de 2010

Geologic Time

this topic talks about the living things that lives in past years and by the time they convert in fossils, also the ideas that prove it,and what is our area and period.

fossils are any trace ,imprint, or remains of a living thing preserved in earth`s crust
 superposition is the idea that in a series of rock layers the bottom layer is the oldest and the top is the youngest

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