Plate Tectonics Crosword

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Across
  1. 3. the theory that the continents can drift apart
  2. 6. made of solid iron and nickel
  3. 8. an underwater mountain range
  4. 9. one giant super continent
Down
  1. 1. made of liquid iron and nickel
  2. 2. a process where new oceanic earth forms at ridges
  3. 3. a boundary that occurs when two plates collide
  4. 4. a boundary that occurs when two plates collide and one slides under the other
  5. 5. a boundary that occurs when two plates separate
  6. 7. influential on the theory of plate tectonics