Crossword Puzzle

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Across
  1. 2. a sheet, quantity, or thickness of material, typically one of several, covering a surface or body
  2. 5. a period of time in history marked by notable events
  3. 10. are fossils used to define and identify geologic periods
  4. 11. when a mold is filled by sediment and hardens
  5. 13. When rocks bend
  6. 15. The preserved traces or remains of an animal
  7. 16. geologic age of a fossil organism or rock
  8. 17. is the process of determining an approximate computed age in archaeology and geology.
  9. 20. actual part of an organism preserved in Ice,Amber,or Tar
  10. 24. types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water
  11. 27. gaps in the geologic record that may indicate episodes of crustal deformation, erosion, and sea level variations
  12. 28. a core sample from a glacier that can tell us the climate of the past
  13. 29. when magma or lava is cooled and forms this rock
Down
  1. 1. the time taken for the radioactivity of a specified isotope to fall to half its original value.
  2. 3. when a tree grows and creates rings it tells us weather patterns over time
  3. 4. The assumption that things that occur now have happened in the past
  4. 6. a fossil with a film coating that consists of the element carbon
  5. 7. a tree that has transitioned into stone by minerals
  6. 8. when original rock is subject to heat and pressure causing both physical and chemical change
  7. 9. which states that sedimentary layers are deposited in a time sequence, with the oldest on the bottom and the youngest on the top
  8. 12. impressions made on the ground by an organism like Burrows,Droppings,and Tracks
  9. 14. where has been significant displacement along the fractures as a result of earth movement
  10. 18. a hollow impression made by an organism
  11. 19. a chart of major biological and geological eras
  12. 21. a long and distinct period of history with a particular feature
  13. 22. when rocks change shape and bend from the inside of earth's layers
  14. 23. a unit of geological time during which a system of rocks is formed
  15. 25. Magma from under the surface is slowly pushed up from deep within the earth into any cracks or spaces it can find
  16. 26. an indefinite and very long period of time