Geological Time Scale

12345678910
Across
  1. 3. the amount of time it takes something to decay
  2. 5. special fossils that indicate geological boundaries to geologists
  3. 6. Faults and dikes are younger than the rock it cuts through
  4. 7. the process in which you use absolute ages of surrounding rock to determine relative age
  5. 8. If a rock is in another rock, the inside one is older than the one surrounding it
  6. 9. tells you if the rock layers/fossils are older or younger than the surrounding ones
  7. 10. the use of half life to determine absolute age
Down
  1. 1. older rock layers are beneath the newer/younger ones
  2. 2. the exact age of a rock or fossil
  3. 4. remains of past life on Earth