Earth's History

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