cross word puzzle

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Across
  1. 4. to go under
  2. 6. a land mass the is constenly moveing under the earth crust
  3. 8. the center of the earth
  4. 9. an area with constent active
  5. 10. to move to each other
Down
  1. 1. the thenist layer of the earth
  2. 2. remanes left from ole plants and bones
  3. 3. when all large land masses where connected
  4. 5. to move apart
  5. 7. a valley in the ocean