Science tic tac toe

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Across
  1. 4. drift of continents through time
  2. 7. outer part of earth
  3. 8. boundary when 2 plates come together
  4. 9. tectonics
  5. 12. trench,depression in the seafloor
  6. 13. fracture in rock
  7. 15. plates slide sideways past each other
  8. 18. upper layer of the earth's mantle
  9. 20. energy with wave like properties
  10. 21. intrusive igneous rock
  11. 22. ridge, chain of mountains
  12. 23. heat moves by touch
  13. 24. theory,explanation
  14. 25. physical force
Down
  1. 1. mass per unit of volume
  2. 2. spreading where tectonic plates split apart
  3. 3. solid layer of hot rock
  4. 4. current that transfers heat
  5. 5. plates move away from each other
  6. 6. hot dense ball of mostly iron
  7. 10. oceanic plate slides under continental plate
  8. 11. outermost shell
  9. 14. uses sound to measure and detect
  10. 16. rock from lava that cools fast
  11. 17. wave produced by an earthquake
  12. 19. third layer of the Earth
  13. 25. single supercontinent