Plate Tectonics

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Across
  1. 3. the thin, least dense layer of the earth
  2. 5. When plates separate, they ___.
  3. 6. When plates collide, they ___.
  4. 8. The last name of the scientist who proved continental drift
  5. 9. When plates slide past each other, they ___.
Down
  1. 1. The biggest layer of the earth
  2. 2. When a plate slides under another, ___happens
  3. 4. The last name of the scientist who theorized continental drift
  4. 6. Movement in the biggest layer
  5. 7. Underwater valley made by plates spreading apart