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