Tectonic hazards

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Across
  1. 4. thin and dense layer of crust
  2. 7. Ejected material such as rock fragments from a volcano
  3. 8. Volcanic mudflow composed of fine sand and silt material
  4. 10. thicker less dense layer of crust
  5. 11. Earths rigid outer layer
  6. 12. Tectonic plates that are moving apart
  7. 13. Area of a subduction zone where intermediate and deep earthquakes occur
Down
  1. 1. Hess and Dietz theory
  2. 2. changes in the earths magnetic field
  3. 3. Scale used to measure volcanic eruptions
  4. 5. Very non-viscous lava which flows long distances
  5. 6. High silica viscous lava
  6. 9. Semi-molten layer at the top of the mantle