Plate tectonics

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Across
  1. 3. two plates slide against each other
  2. 6. melted rock on Earth’s surface
  3. 7. separate
  4. 8. a slowly flowing layer of solid and melted rock formed by heat and pressure
  5. 10. continents were joined together in one large landmass
  6. 11. two tectonic plates grind past each other in a horizontal direction
  7. 12. the solid outer part of Earth that includes the crust and upper mantle
  8. 15. It is the only liquid layer, a sea of mostly iron and nickel
  9. 17. A layer of the earth's crust that lies under the seven continents
  10. 19. A dropped zone where two tectonic plates are pulling apart
  11. 20. The innermost layer of the earth, an extremely hot, solid sphere of mostly iron and nickel
  12. 21. The type of crust lying under the oceans of the world
Down
  1. 1. collide
  2. 2. A raised area or mountain range under the oceans formed
  3. 4. molten hot rock
  4. 5. An area where oceanic crust and continental crust are colliding
  5. 9. The border between two tectonic plates
  6. 13. The process that forms new ocean floor and oceanic crust
  7. 14. one plate going under another
  8. 16. the outermost layer of Earth.
  9. 18. when an oceanic plate sinks underneath a