Earth's Tectonic Plates

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Across
  1. 2. Causes the plates to move within Earth's mantle.
  2. 5. The point on Earth's surface directly above the place where an earthquake occurs.
  3. 7. The oldest continental crust is about 4 ___ yrs old.
  4. 10. ___ is divided into plates.
  5. 11. Plates move by _____ spreading.
  6. 14. A device capable of measuring the magnetic field.
  7. 15. ____ polar wonder is a phenomenon that the magnetic pole has seemed to moved.
  8. 16. Measures the ground shaking.
Down
  1. 1. Were once joined and the moved apart.
  2. 3. Rocks on the seafloor that were at the mid-ocean ridges.
  3. 4. Noticed that South America and Africa appeared to fit together like a puzzle.
  4. 6. A large chunk of lithosphere.
  5. 8. Plate move around Earth's surface at a rate of a few ____ a year.
  6. 9. ____ material is heather above the core.
  7. 12. Some rocks contain little ____.
  8. 13. The magnetic ___ reverses from time to time.