Plate Tectonics

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Across
  1. 4. One giant land mass, 200 million years ago
  2. 5. A crack, split, or break in something
  3. 6. Long, narrow ditch
  4. 7. Proposed theory about ocean-floor material
  5. 10. A submarine ridge system
  6. 11. Used to join or strengthen things
  7. 15. Where two plates collide and the denser plate subducts under the less dense plate
  8. 16. Hot fluid similar to lava
  9. 17. Type of plate boundary
  10. 18. Outer part of earth, inc. the crust and mantle
Down
  1. 1. The gradual movement of continents through geologic time
  2. 2. Type of plate boundary
  3. 3. Type of plate boundary
  4. 8. ______ spreading
  5. 9. The upper layer of earth's mantle, below the lithosphere
  6. 12. Hard inner/outer layer of earth
  7. 13. The movement caused within a fluid caused by the tendency of hotter fluid to rise and cooler material to sinkdense Closely compacted in substance
  8. 14. Created Continental Drift Theory
  9. 16. Capable of being attracted by a magnet