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