Landen White's land crossword

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Across
  1. 2. a vent in the crust of the earth or another planet
  2. 5. ancient supercontintent that included almost all of the earth's land area
  3. 7. a layer within the earth between the crust and the core
  4. 10. a hypothetical land mass in the northern hemisphere
  5. 11. a thin pasty suspension
  6. 12. a moving fluid mass composed of volcanic debris
  7. 13. a sea floor mountain system formed by plate tectonics
  8. 16. the process and dynamics of tectonic plate movement
  9. 18. a slow movement of continents
  10. 19. the action of the water conditions in altering the color, texture, compositions, ect
  11. 20. outer most layer of the earth
Down
  1. 1. a natural feature of land surface
  2. 3. a German climatologist
  3. 4. a hot chaotic mixture of rock
  4. 6. ancient supercontintent
  5. 8. molten rock that issues from a volcano
  6. 9. major fracture of the earths crust in extreme western north america
  7. 14. volcanos that have not erupted
  8. 15. inner most layer of the earth
  9. 17. the outside layer of the earth
  10. 21. the action or process of eroding