Across
- 5. isotopes decaying creating heat
- 10. space rock that lands on earth
- 12. largest layer under crust
- 14. ground above water
- 15. where plates smash into each other
- 18. New isotope formed from decay
- 19. neutrino emitted from decay
- 20. currents that transfer heat in the earth
Down
- 1. Vibration caused by movement in the earth
- 2. main part of mantle
- 3. where plates move away from each other
- 4. solid crust and upper mantle
- 6. tectonic plates sliding beside each other
- 7. isotope that decays
- 8. ground under water
- 9. dating technique used to date rocks
- 11. theory of tectonic plates
- 13. solid center of earth
- 16. Liquid part of Earth´s center
- 17. third layer of the atmosphere