Plate tectonics

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Across
  1. 4. boundary that spreads apart
  2. 7. zone where a oceanic plates subducts under a continental plate
  3. 9. the thickest layer
  4. 12. boundary which collides
  5. 13. rock hard surface we stand on
  6. 14. the crust, the mantle and the core
  7. 15. where 2 plates compress
  8. 16. layer touching the core
  9. 17. innermost layer
  10. 18. an area between 2 tectonic plates
Down
  1. 1. boundary which plates slide across
  2. 2. Plate tectonics is the scientific theory that Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving
  3. 3. ies between the thermosphere and the stratosphere
  4. 5. a theory of if the tectonic plates drift
  5. 6. the layer we stand on
  6. 8. the rigid outer part of the earth, consisting of the crust and upper mantle
  7. 10. zone of Earth's mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere.
  8. 11. theory that oceanic plates slowly move