plate tectonics

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Across
  1. 2. The weight of a subducting plate helps pull the trailing lithosphere into the subduction zone
  2. 5. It is a hypothesis which proposed that earth's continents had once been joined in one big landmass
  3. 6. A greek word that means "all the earth"
  4. 7. This is a change in earth's magnetic field.
  5. 8. A device that can detect small changes in magnetic fields.
  6. 9. A line on a map that connects points that have the same age
  7. 10. states that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches
Down
  1. 1. one of the two plates is descending beneath the other
  2. 3. states that earth's crust and rigid upper mantle are broken into enormous slabs called plates
  3. 4. The study of this magnetic record