Across
- 1. physical changes to rocks due to heat
- 7. Habitats, habitats where sediments are carried away and fossils cannot form, but can also destroy already-preserved fossils.
- 9. Record, the total collection of all discovered and undiscovered fossils preserved within Earth's strata, arranged in chronological order to document the history of life on the planet.
- 10. sediments bury dead organisms, which can help protect and preserve an organism’s remains.
- 11. the layers in a sedimentary rock, due to different sediments being deposited at different times.
- 12. when preserved remains are replaced by minerals of the surrounding sediment.
Down
- 1. minerals slowly replacing the original bones, teeth or other parts of the organism turning it to stone.
- 2. dating, uses the relative position of rock layers within the rock column.
- 3. are preserved remains or traces of organisms that lived in the past (e.g., bones, shells, footprints, burrows).
- 4. , high temperatures associated with processes of erupting volcanoes
- 5. , the number of different species, or types, of related organisms.
- 6. Dating, a dating method that lets you know the actual age of rock. This is done by measuring the abundance of different types of radioactive materials trapped within rocks.
- 8. over time, chemical reactions occur which cement the sediments into stone.