AFoster crossword

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Across
  1. 4. Vibrations in the Earth's crust and mantle
  2. 8. A weak area in Earth's crust can form islands
  3. 10. The rise of warmer material and the fall of cooler material
  4. 12. The theory for which all contemporary understanding of tectonic plates is based
  5. 15. To bend
  6. 16. Magnetic sphere surrounding the Earth
  7. 17. Zone of charged particles
  8. 19. The thickest layer of the earth under the crust
  9. 20. When continental tectonic plates collide
  10. 21. The outer most and thinnest layer of the Earth
Down
  1. 1. When two tectonic plates move past each other horizontally
  2. 2. The process of sorting different materials based upon density.
  3. 3. When tectonic plates push each other apart
  4. 4. When continental crust and oceanic crust collide and the denser plate subducts
  5. 5. Formed from volcanic activity
  6. 6. 1000 meters
  7. 7. Ions from the sun
  8. 9. Rock formed by heat and pressure
  9. 11. Rocks formed from sediment
  10. 13. The inner most layer of the Earth
  11. 14. Study of the Earth's crust
  12. 18. A device that measures seismic activity