Fossil Crossword puzzle

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Across
  1. 4. when the small holes in an organism's body are filled with minerals
  2. 9. the age of something compared to something else
  3. 11. intrudes in on rock layers
  4. 12. this occurs when an organisms body tissues are replaced by minerals
Down
  1. 1. increases an organism's chances of becoming fossil
  2. 2. preserved remains or traces of an organism
  3. 3. the name for layers of rocks
  4. 5. miniature fossils of tiny organism
  5. 6. a scientist who studies fossils
  6. 7. when a organism leaves footprints, burrows , or other features
  7. 8. fossils that form when the body of an organism leaves an imprint in the sediment
  8. 10. this thing still lives today and also lived 40,000 years ago