Plate Tectonics

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Across
  1. 7. drift is the hypothesis that today’s continents were one large landmass
  2. 8. the outermost physical layer of Earth
  3. 9. a system of ideas that explains many related observations about the world
  4. 10. the layer immediately below the lithosphere
  5. 12. breaks in rocks
  6. 13. boundary forms when plates move away from one another
  7. 14. the large moving pieces that the lithosphere is divided into
  8. 15. a stress that causes a material to twist or become distorted
  9. 17. a stress that squeezes or shortens material
  10. 18. a stress that lengthens a material or pulls it apart
Down
  1. 1. when one plate sinks below another plate
  2. 2. the bending, tilting, and breaking of rock
  3. 3. the process when new sea-floor forms from rising magma
  4. 4. underwater mountain belts
  5. 5. boundary forms when plates move toward each other and collide
  6. 6. form along mid-ocean ridges
  7. 11. the name Wegener called the supercontinent
  8. 16. boundary forms when two tectonic plates move past each other in opposite directions