plate tectonics

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Across
  1. 7. is the layer of gases known as air
  2. 8. the core of the earth
  3. 11. occurs when forces act to stretch an object
  4. 12. first layer of the earth
  5. 14. comes from a Japanese word
  6. 15. Another word for gravity waves
Down
  1. 1. movement of the tectonic plates in the crust
  2. 2. the most rigid layer of the earth
  3. 3. earthquake scale
  4. 4. forms in the water when subduction occurs
  5. 5. occurs when something is squeezed
  6. 6. the first wave
  7. 9. happen when tectonic plates collide
  8. 10. is the bones found in the earth
  9. 13. a break in the earth's crust