Puzzling Earth

2. When two tectonic plates come together
5. Antineutrinos produced by the decay of the radioactive elements in the Earth.
9. The solid, hot inner part of the mantle
10. The more stable ending isotope after radioactive decay.
11. The emission of energy (ionizing radiation)
12. The thick part of Earth's crust that makes up land.
14. The thinner, denser layer of Earth's crust made up of the ocean
16. Measures the amount of radioactive material left in an object and compares it to the amount of decay product.
17. Waves that are caused by sudden movement of materials in the Earth, tectonic plates.
19. The original unstable isotope.

1. The theory of how land forms are created based on the movements inside the Earth.
3. When two tectonic plates move away from each other
4. Cycles that are driven by heat occurring in the mantle.
6. The liquid outside layer around the Inner Core.
7. A rock in space that falls down to Earth.
8. Semi-solid thickest layer of the Earth.
13. The solid, iron, innermost layer in the center of the Earth.
15. The solid outer part of the Earth composed of the crust and upper mantle.
18. The semi solid upper mantle underneath the lithosphere.
20. When two tectonic plates slide past each other.