Fossils and Relative Dating

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Across
  1. 3. The principle that states the oldest rocks are found at the bottom.
  2. 5. The type of rock that fossils are found in
  3. 6. The preserved remains of a once-living thing
  4. 8. The preserved evidence of an organism's activity or behavior
  5. 11. The type of rock that forms intrusions that cut across rock layers
  6. 14. A fossil that is an impression of an organism in rock
  7. 15. The principle that states that is one geologic feature cuts across another, the feature it cuts across is older.
  8. 16. When rock layers bend due to pressure being exerted on them at convergent boundaries
  9. 19. Using the ages of nearby rocks and geologic features to determine age by comparison
  10. 20. The movement of these causes rocks to become deformed or disturbed
  11. 21. When rock layers are shifted due to being pushed up or down unevenly
Down
  1. 1. Represents a gap in the rock record due to erosion.
  2. 2. When the original tissues of an organism are preserved
  3. 4. The principle that states that most rock forming material is deposited in horizontal layers
  4. 7. The principle that states that rock that is encased in another rock is older.
  5. 9. The principle that states that sediments are deposited in continuous sheets in all directions
  6. 10. When sediments fill a mold fossil, get compressed, and harden into another fossil
  7. 12. A crack or fracture in rock that allows rock masses to slide past each other
  8. 13. A collection of all of the fossils ever discovered on Earth
  9. 17. Occurs when a dead organism is compressed over time, releasing the liquids and gases inside them. This process leaves behing a dark brown or black stamp of the organism
  10. 18. When minerals replace an organism's original material and harden into rock