tectonic plates earthquakes and volcanoes

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Across
  1. 2. created when a volcano blows off it's cone and the magma chamber empties and collapses
  2. 3. volcanoes which have alternate explosive and nonexplosive eruptions
  3. 4. volcanoes with steep sides and violent erruptions
  4. 5. point on surface where earthquake is strongest
  5. 8. molten rock
  6. 10. when one plate goes under another plate
  7. 13. scale that measures intensity of a quake
  8. 14. projectiles from volcano
  9. 17. created by heated and cooling magma that causes tectonic plate movement
  10. 18. volcanoes with gentle slopes and nonviolent erruptions
  11. 19. the gas, ash and molten rock coming from a volcano
Down
  1. 1. section of crust
  2. 2. boundaries that come together
  3. 6. the supercontinent before the continents drifted
  4. 7. breaks created by crust movement
  5. 9. volcanoes resulting in long breaks in the crust when divergent plates pull away from each other
  6. 11. boundaries that move apart
  7. 12. boundaries that move beside each other in opposite directions
  8. 15. the point underground where earthquake first occurs
  9. 16. waves created by the movement of tectonic plates