Unit 6 Review: Plate Tectonics

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Across
  1. 4. dangerous cloud of gas, ash, and debris from a volcanic eruption
  2. 6. solid center of the earth only
  3. 7. surface layer of the earth
  4. 8. the visible data showing earthquake waves amplitude
  5. 9. layer of the earth responsible for convection currents that move tectonic plates
  6. 13. location on the surface where the earthquake has the greatest impact
  7. 18. secondary waves; slower
  8. 20. thick, slow moving lava
  9. 22. The scientist proposed the theory of continental drift.
  10. 25. layer of the earth including the crust and the top part of the mantle
  11. 27. The theory describing the movement of tectonic plates.
  12. 28. boundary caused by plates drifting away
Down
  1. 1. directly under the lithosphere
  2. 2. boundary caused by plates colliding
  3. 3. the moment ___________ scale measures severity of an earthquake
  4. 5. molten rock under the earth's surface
  5. 10. molten rock on the earth's surface
  6. 11. The section of the core responsible for geomagnetic shield
  7. 12. volcano with low slopes and low viscosity lava
  8. 14. primary waves; first to arrive
  9. 15. point within the earth where the earthquake originates
  10. 16. caused by underwater earthquakes
  11. 17. large volcano able to re-erupt, built from layers of ash and lava
  12. 19. boundary caused by sliding plates
  13. 21. Seafloor _______________ creates new oceanic crust at the mid-ocean ridge line.
  14. 23. A natural disaster combining a great flood and landslide.
  15. 24. when the oceanic plate sinks below the continental crust
  16. 26. these waves cause the most damage