Puzzling Earth

2. Method of dating rocks and other objects by looking at the amount of parent/daughter isotopes
8. The fluid layer of the Earth's core, mostly iron and nickel
9. The isotope formed after the parent isotope decays
12. A process that involves moving energy from one place to another
13. When a parent isotope loses particles and creates a new daughter isotope of another element
15. The innermost layer of the Earth, a hot dense ball made of mostly iron
17. The part of Earth's crust that forms continents/large landmasses
19. A tectonic boundary where two plates slide past each other
20. Solid, outer part of Earth that contains the upper portion of the mantle and the crust

1. A theory about Earth's crust and the interactions of plates moving above the mantle
3. The upper layer of the Earth's mantle, below the Lithosphere
4. Decay of radioactive elements
5. Elastic waves in the earth produced by an earthquake or other phenomenon
6. The lower part of the mantle, beneath the asthenosphere
7. A meteor that passes earth's atmosphere and hits earth
10. A tectonic boundary where two plates are moving away from each other
11. A tectonic boundary where two plates are moving toward each other
14. The isotope that decays
16. The part of Earth's crust underneath the ocean basins
18. Layer of the Earth between the Crust and the outer core.