Across
- 2. break in earth's crust along which movement occurs
- 3. the point on the Earth's surface directly above the focus of an earthquake
- 4. when magma hardens inside a volcano and the volcano erodes forms this
- 6. bits of rock or solidified lava dropped from the air
- 7. most active volcano in the world
- 10. forms when magma hardens before it reaches the surface into a dome shape
- 11. Plastic-like layer of the lower mantle on which the lithosphere move
- 13. Harry Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge
- 14. break in rock caused by compressive forces, where rock above the fault surface moves upward relative to the rock below the fault surface
- 15. a volcano with very steep sides
- 17. sections of the Earth's upper mantle and crust that move slowly
- 18. when magma squeezes into cracks in rocks and hardens usually vertically
- 19. point under the surface of the Earth where an earthquake originates
- 20. Alfred Wegener's theory that continents can drift apart from one another and have done so in the past
- 23. a volcano with gently sloping sides
- 26. ocean wave produced by an earthquake on the ocean floor
- 27. break in rock caused by shear forces, where rocks move past each other without much vertical movement
- 29. seismic wave that moves rock particles at right angles to the direction of the wave
- 30. when the top of a volcano collapses it forms this
- 31. Wave which causes rock particles to move in a backward rolling and side to side swaying motion, this is the most destructive earthquake wave
- 32. measure of the energy released by an earthquake
Down
- 1. a caldera that formed on Mt.Mazama and filled with water
- 5. a volcano that is in between shield and cinder cone volcanoes
- 8. the solid, outer layer of the earth that consists of the crust and the upper part of the mantle
- 9. The process by which an earthquake's violent movement suddenly turns loose soil into liquid mud
- 12. A current in the asthenosphere caused by the rising of heated fluid and sinking of cooled fluid. Causes the movement of tectonic plates.
- 16. a wave produced by an earthquake
- 17. a theory stating that the earth's surface is broken into plates that move
- 21. break in rock caused by tension forces, where rock above the fault surface moves down relative to the rock below the fault surface
- 22. an island that was formed by volcanic eruptions along the Mid-Atlantic Ridge
- 24. seismic wave that moves rock particles back and forth in the same direction that the wave travels
- 25. the shaking that results from the movement of rock beneath earth's surface.
- 27. when magma squeezes into cracks in rocks and hardens usually horizontally
- 28. large, ancient landmass that was composed of all the continents joined together