AFoster crossword

4. Vibrations in the Earth's crust and mantle
8. A weak area in Earth's crust can form islands
10. The rise of warmer material and the fall of cooler material
12. The theory for which all contemporary understanding of tectonic plates is based
15. To bend
16. Magnetic sphere surrounding the Earth
17. Zone of charged particles
19. The thickest layer of the earth under the crust
20. When continental tectonic plates collide
21. The outer most and thinnest layer of the Earth

1. When two tectonic plates move past each other horizontally
2. The process of sorting different materials based upon density.
3. When tectonic plates push each other apart
4. When continental crust and oceanic crust collide and the denser plate subducts
5. Formed from volcanic activity
6. 1000 meters
7. Ions from the sun
9. Rock formed by heat and pressure
11. Rocks formed from sediment
13. The inner most layer of the Earth
14. Study of the Earth's crust
18. A device that measures seismic activity