Plate Tectonics

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