puzzling earth science

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 and has fallen to the surface of a planet or moon
13. a neutrino or antineutrino emitted during the decay
14. Boundary When two plates come together
16. Decay the emission of energy in the form of ionizing radiation.
17. Core liquid, is about 1300 miles (2092 km) thick
18. Crust the outermost layer of Earth's lithosphere
19. Waves vibrations in the earth that transmit energy and occur during seismic activity such as earthquakes,
20. region of the upper atmosphere

1. Isotope the more stable form
2. upper layer of the earth's mantle
3. the rigid outer part of the earth
5. Current heat-driven cycles that occur in the air, ocean, and mantle
7. Dating calculates an age in years
8. Crust the denser crustal layer of Earth
9. Boundary occurs when two tectonic plates move away from each other.
12. Plates composed of the oceanic lithosphere
15. Boundary formed where two tectonic plates pass laterally by one another.