Fossils and Rock Formations

1. We are currently living in the ___________ era.
3. Over millions of years, some of the plains in western Peru transformed into large mountains, such as __________ mountain.
4. Dinosaurs went extinct after the __________ era.
5. Fossils are mineralized __________ or evidence of plants or animals that lived long ago.
9. Heat and pressure can change sedimentary rocks into _________________ rocks.
12. Sediments harden in horizontal rock layers in different _______ due to floods and dry periods leaving different sediments.
13. New layers of sediment are deposited over older layers. These layers harden into rock and create ____________ patterns, or patterns that are parallel to the earth's surface.
15. __________ appear in rock strata in a certain order.
16. Cast and mold fossils are _________ of an organims's body, left in rock.

2. Fossils can provide clues about the ________________ where organisms lived.
6. Body fossils form when the dead body of a plant or animal is covered in seidments.
7. Scientists compare the ages of fossils and rock layers, or ________, by examining the order of the layers.
8. From fossils found in rock strata, Scientists have been about to develop a ___________ time scale.
10. Trace fossils are _______________ such as footprints, burrows, or nests made by once living organisms.
11. Sedimentary rocks change when _____________ on Earth change.
14. Rock layers change when ________ from deep underground pushes into the layers.