Fossils and Geologic Time

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Across
  1. 4. the amount of time it takes for half of a remaining isotope to decay
  2. 6. when water mineralizes and turns to stone
  3. 8. leave a cavity or indent where an organism once was
  4. 9. a fossil is classified as this when it is widespread, abundant, and was living for a short period of time
  5. 10. the type of rock that fossils are found in
  6. 13. the law meaning that rocks found inside of other rocks are the older of the two
Down
  1. 1. determining the age or rock by using radioactive material to find the half-life
  2. 2. the law that newer rock layers are on top of old layers
  3. 3. forms when an organism dies and the space is filled with minerals
  4. 5. features like faults and dikes are newer than the rock they cut through
  5. 7. fossil forms when an insect is trapped in amber
  6. 11. provides indirect evidence of life in the past
  7. 12. occurs when plants and animals die, leaving a film of carbon behind