Crossword Puzzle

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