vocab 2

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Across
  1. 3. rebound the sudden return of elastically deformed rock to its undeformed shape
  2. 8. plates Sections of the Earth's crust that move due to convection currents.
  3. 9. is A rigid layer made up of the uppermost part of the mantle and the crust.
  4. 11. boundary A plate boundary where two plates move toward each other.
  5. 12. reversal a switch in the direction of Earth's magnetic field so that the magnetic north pole becomes the magnetic south pole and the magnetic south pole becomes the magnetic north pole.
  6. 14. The edge between two or more plates classified as divergent, convergent, or transform by the movement taking place between the plates.
  7. 15. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
  8. 16. The soft layer of the mantle on which the lithosphere floats.
  9. 21. The strong, lower part of the mantle between the asthenosphere and the outer core
  10. 22. A hypothesis that has been tested with a significant amount of data
  11. 23. The point beneath Earth's surface where rock breaks under stress and causes an earthquake
  12. 24. the bending, tilting, and breaking of Earth's crust; the change in the shape of rock in response to stress
Down
  1. 1. drift The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
  2. 2. spreading The process by which molten material adds new oceanic crust to the ocean floor
  3. 4. A break in the earth's crust
  4. 5. The central part of the earth below the mantle
  5. 6. tectonics A theory stating that the earth's surface is broken into plates that move.
  6. 7. current a current caused by the rising of heated fluid and sinking of cooled fluid
  7. 10. The layer of hot, solid material between Earth's crust and core.
  8. 13. earth'soutermostlayer
  9. 17. Point on Earth's surface directly above an earthquake's focus
  10. 18. The shaking that results from the movement of rock beneath Earth's surface.
  11. 19. boundary A plate boundary where two plates move away from each other.
  12. 20. boundary A plate boundary where two plates move past each other in opposite directions