Fossils, Rocks and Change

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Across
  1. 1. physical changes to rocks due to heat​​​
  2. 7. Habitats, habitats where sediments are carried away and fossils cannot form, but can also destroy already-preserved fossils.
  3. 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.
  4. 10. sediments bury dead organisms, which can help protect and preserve an organism’s remains.
  5. 11. the layers in a sedimentary rock, due to different sediments being deposited at different times.
  6. 12. when preserved remains are replaced by minerals of the surrounding sediment.
Down
  1. 1. minerals slowly replacing the original bones, teeth or other parts of the organism turning it to stone.
  2. 2. dating, uses the relative position of rock layers within the rock column.
  3. 3. are preserved remains or traces of organisms that lived in the past (e.g., bones, shells, footprints, burrows).
  4. 4. , high temperatures associated with processes of erupting volcanoes
  5. 5. , the number of different species, or types, of related organisms.
  6. 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.
  7. 8. over time, chemical reactions occur which cement the sediments into stone.