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