Earth's History

3. The number of years that have passes since the rock formed
5. Thin coating of carbon preserves delicate plant leaves
6. Provide evidence of activites of ancient organisms
7. Undisturbed horizontal sedimentary rock layers the oldest layer is at the bottom and each higher layer is younger than the layers below it
9. Process that preserves entire organism
11. Form when living things die and are buried by sediment
12. Provides evidence about the history of life on Earth
15. A hollow area in sediment in the shape of an organism
16. Turned into stone

1. Scientists who study fossils
2. A break in the Earth's crust that is younger than the rock it cuts through
4. An organism that no longer exists
5. A solid copy of the shape of an organism
8. Form when minerals replace all of an organism
10. The age of a rock compared to the ages of other rocks
13. A fossil that is widely distributed and represents an organism that existed for a geologically short period of time. They help geologists tell the relative ages of rock layers.
14. The change in living things over time
17. When magma pushes into bodies of rock below the surface, cools and hardens forming a mass of igneous rocks. It is always younger than the surrounding layers.