Across
- 4. Core a hot, dense ball of (mostly) iron
- 6. Isotope The original unstable isotope
- 10. the mostly solid bulk of Earth's interior
- 11. a rock that originated in outer space
- 13. a neutrino or antineutrino
- 14. Boundary When two plates come together
- 16. Decay the emission of energy in the form of ionizing radiation.
- 17. Core about 1300 miles (2092 km) thick
- 18. crust thick part of the earth's crust
- 19. Waves vibrations in the earth that transmit energy
- 20. region of the upper atmosphere
Down
- 1. Isotope the more stable form
- 2. the upper layer of the earth's mantle
- 3. the rigid outer part of the earth
- 5. Current heat-driven cycles
- 7. Dating Radiometric dating calculates an age in years
- 8. crust denser crustal layer of Earth
- 9. Boundary two tectonic plates move away
- 12. Plates composed of the oceanic lithosphere
- 15. Boundary two tectonic plates pass laterally