Earth's History Crossword Puzzle

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Across
  1. 2. a type of rock created by heat and pressure
  2. 4. gradual changes over time
  3. 6. fossils that lived in a specific time period that is used to identify the time and rock layer
  4. 8. when a dead organism decays, it leaves a visible carbon layer behind which are called __
  5. 12. actual age of an object
  6. 13. time period in geologic time which is shorter than a period
  7. 14. minerals pass through and replace organisms cells and turns it into stone
  8. 17. something happening to a rock that is out of place and breaks the rock pa
  9. 19. a law that states younger rock lies above older rock
  10. 23. thickness of some material put on top of a surface or more material
  11. 24. sediment fills in the mold and turns into rock
  12. 26. a type of rock where sediment and possibly fossils are packed together and hardens
  13. 28. a type of rock formed by magma
  14. 29. a long period of time in geologic time, but shorter than an eon and longer than an epoch
Down
  1. 1. an estimate of an age compared to another object
  2. 3. rock layers slant from Earth's forces
  3. 5. remains of an organism that have not been changed
  4. 7. magma being forced into rock formations and cools
  5. 9. half the atoms decaying
  6. 10. visible shape after an organism has been buried in sediment and decayed away
  7. 11. rock layers bend
  8. 15. longest time period in geologic time
  9. 16. remains of an organism that have been preserved
  10. 18. time period of the development and formation of the Earth
  11. 20. time in geologic time where rocks were formed and is longer than an epoch
  12. 21. evidence of organism activity that has been preserved
  13. 22. Earth's crust shifts past one another breaking the Earth's crust
  14. 25. rings found in a tree that accurately show the history of the weather patterns
  15. 27. a sample that shows the different layers of ice and how the Earth's climate has change over time