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Across
  1. 1. Boundary Where two plates slide past each other horizontally.
  2. 4. tectonics the understanding that the top layer or lithosphere of the Earth's crust is divided into many large rocky plates
  3. 5. Triggered by large, underwater earthquakes or volcanic eruptions.
  4. 8. The vertical elevation of the Earth's surface
  5. 9. Molten or semi-molten rock beneath the surface.
  6. 12. The outermost layer of the Earth.
  7. 14. Movement in the mantle caused by heat differences, driving plate movement
  8. 16. A vent in the crust where magma and gases erupt.
  9. 18. cold oceanic lithosphere sinks back into the mantle and is recycled
  10. 19. The point on the surface directly above an earthquake's origin.
  11. 20. The rigid outer layer of the Earth, consisting of the crust and upper mantle.
  12. 24. A break in Earth's crust along which movement occurs.
  13. 25. Where two plates move away from each other.
Down
  1. 2. Process forming new oceanic crust at mid-ocean ridges.
  2. 3. Hypothesis that continents move slowly across the Earth's surface.
  3. 6. Vibrations caused by sudden movement of rock along a fault.
  4. 7. Massive, rigid, moving pieces of the Earth's lithosphere.
  5. 10. The soft, plastic layer in the upper mantle that the plates move on.
  6. 11. The process where one tectonic plate sinks beneath another.
  7. 13. A volcanically active area far from a plate boundary.
  8. 15. Where two plates move toward each other.
  9. 17. The layer of hot, solid material between the crust and core.
  10. 21. The ancient supercontinent that included all of Earth's landmasses
  11. 22. A deep valley formed where two plates move apart.
  12. 23. An underwater mountain chain formed by divergent plates.