Across
- 3. _________fossil - a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
- 4. The preserved remains or traces of an organism that lived in the past
- 7. A type of fossil that forms when a mold becomes filled in with minerals that then harden
- 9. The process by which minerals replace parts of an organism.
Down
- 1. A scientist who studies fossils
- 2. the process by which organic matter exposed to minerals over a long period is turned into a stony substance.
- 5. _________dating - a scientific method used to determine the age of an artifact
- 6. _________dating - Method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
- 8. _________fossil - a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
- 10. The impression of an organism in a rock