Earth's History

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Across
  1. 1. old remains of things
  2. 4. selecting of traits based on survivability success.
  3. 5. The process of the Earth changing over time
  4. 8. rock shape changing because of the weather
  5. 11. the long period of time occupied by the earth's geologic history.
  6. 12. one of the three main rock types, the others being sedimentary and metamorphic
  7. 13. the action of intruding.
  8. 14. describe the variation in the DNA sequence in each of our genomes
  9. 15. Exact age
  10. 17. Tectonics the lithosphere of the earth is divided into a small number of plates
  11. 18. age estimate
  12. 19. Rock that has formed through the deposition and solidification of sediment
  13. 21. a basic law of geochronology
Down
  1. 2. a fossil that is useful for dating and correlating the strata in which it is found.
  2. 3. scientist who studies fossils.
  3. 6. Natural selection
  4. 7. chronological dating that relates geological strata to time
  5. 9. defined as any genetic change in a population that is inherited over several generations
  6. 10. Changing shape by wind and water
  7. 16. The action of extruding
  8. 20. a long and distinct period of history with a particular feature or characteristic.