Plate Tectonics

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Across
  1. 2. one plate is more dense than the other
  2. 3. plates slide past each other and cause earthquakes
  3. 5. means builder mountains, volcanoes and riff valley
  4. 8. plates move towards each other and collide
  5. 10. the solid crust and upper mantel of the Earth's Interior
  6. 12. plates move away from one another
Down
  1. 1. are the circulation of material caused by different temperatures
  2. 4. two plates seem to be moving the fastest away from one another
  3. 6. in the middle of continents form riff valleys
  4. 7. behaves like "plastic" material - easily molded
  5. 9. the spreading of the seafloor causes mid- ocean ridges
  6. 11. were tectonic plates meet