James Bickett's Crossword Puzzle

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Across
  1. 2. The boundary of tectonic plates that move into each other.
  2. 4. Sliding plate force.
  3. 7. The device that measures small changes in magnetic fields.
  4. 8. A large depression with steep walls formed by downward displacement of a block of the Earth's surface.
  5. 10. The tone of regular beats of a single tone.
  6. 12. Another name for plate boundary.
  7. 13. Alfred Wegner's idea that the continents all used to be part of a single landmass.
  8. 14. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
Down
  1. 1. The study of magnetic record in rocks.
  2. 2. The name of the idea of plate tectonics.
  3. 3. The change in the direction of the earth' polarity?
  4. 5. Alfred Wegner's name for the supercontinent.
  5. 6. Process of the ocean floor moving away from an ocean ridge.
  6. 9. The boundary of tectonic plates that move a part from each other.
  7. 11. The portion of motion of a tectonic plate.