Across
- 7. A scientist who studies prehistoric life.
- 10. A word that describes a fossil that has partial replacement of the body's chemicals.
- 12. The preserved evidence in rocks or soils of organisms that were once alive.
- 13. A type of fossil formed when part of the organism is changed into another mineral.
- 15. Comparing strata in different locations to determine their age.
Down
- 1. A type of fossil formed when the dead body partially decays and leaves a thin black deposit of carbon.
- 2. A method of dating in which the age of one fossil or rock is compared with another.
- 3. A type of fossil formed when part of the organism such as a skeleton is preserved and remains in its original form.
- 4. A list showing the classification of all the species on Earth that have been found as fossils.
- 5. A type of fossil that has the preserved remains of things such as imprints of a body, fossilised dung and burrows.
- 6. A type of fossil formed by the weight of sediments squashing the body, which completely or partially decays.
- 8. layers of sedimentary rock.
- 9. A fossil that can be used to compare the relative age of rock strata in different locations.
- 11. A method of finding a relative age of two bones from the same area, by comparing the amount of fluorine in them.
- 14. When an organism in rock decomposes and the space in the rock fills with soil which turns into rock.