Plate Tectonics

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Across
  1. 3. What phenomena did Alfred Wegener discover?
  2. 7. What theory comprises the phenomenon that the plates "drift" across the lithosphere?
  3. 8. What is the innermost layer of the Earth?
  4. 9. What ridge is formed at a divergent plate boundary?
  5. 10. What type of wave does a seismograph read?
  6. 12. What scientific rule says that matter cannot be created nor destroyed?
Down
  1. 1. How is old plate material "recycled" back into the Earth?
  2. 2. Hess originally discovered this phenomena
  3. 4. What type of valley forms at a divergent plate boundary?
  4. 5. What force in the mantle moves the plates?
  5. 6. What layer of the Earth has a convection cycle, ultimately causing plate tectonics?
  6. 11. What is created at a transform boundary (besides an earthquake)?