Plate tectonics crossword

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Across
  1. 1. the study of the physics of the earth and its environment in space
  2. 2. the center of the earth
  3. 5. the process in which one plate collides with and is forced under another plate
  4. 6. the layer below the crust
  5. 8. something that erupts and lava comes out
  6. 11. the separation of plates
  7. 13. theory of earth's outer shell
  8. 15. a deep depression in the ocean floor caused by the convergence of plates and subduction of one plate
  9. 18. a fluid layer above the inner core and below the mantle
  10. 19. force on an object by something touching it
Down
  1. 1. a scientist who studies the solid, liquid, and gaseous matter that constitutes earth and other terrestrial planets
  2. 3. a sudden shaking of the ground
  3. 4. circle of volcanoes
  4. 7. an area of rock that has been bent by stress
  5. 9. the uppermost layer of the earth
  6. 10. the theory that the configuration of the earth's continents was once different
  7. 12. it is the molten version of rock
  8. 14. the transfer of heat caused by molecular motion in liquid or gas
  9. 16. above the core
  10. 17. an area of fracturing between rocks