Across
- 2. The estimated age for something, like a rock
- 4. years
- 6. The remains of dead organisms preserved in a rock or mold
- 8. Useful for dating and correlating the strata in which
- 9. Earth's crust cooled and tectonic plates formed
- 11. is found
- 12. Lasted about 2
Down
- 1. Rocks in the rock layer are older than the layer itself.
- 2. Rocks on the bottom are always younger than the rocks on top of it
- 3. The exact time for something, like a rock
- 5. The rate at which elements decay into daughter products
- 7. Cuts in the rock layers Are always younger
- 10. Most chaotic weather at that time