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Rock layers meet - PowerPoint PPT Presentation

A Trip through Geologic Time

A Trip through Geologic Time. Chapter 8. How a Fossil Forms. Fossils are the preserved remains or traces of living things Most fossils form when living things die and are covered by ___________________. As it slowly hardens into rock, it preserves the shape of the organisms.

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The Relative Age of Rocks

The Relative Age of Rocks. Why do sedimentary rocks have layers?. The sediments (particles of sand, rocks, etc) is deposited in flat layers one of top of the other. Over time, the sediment hardens and changes into sedimentary rock. What is an unconformity?.

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Rock layers meet - PowerPoint PPT Presentation

A Trip through Geologic Time

The Relative Age of Rocks