Plate tectonics and seafloor spreading

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Across
  1. 2. theory that pieces of the earth's lithosphere are in constant motion driven by convection currents in the mantle
  2. 5. one of the clues about seafloor spreading involving the polarity of the earth
  3. 8. a boundary where two plates move apart
  4. 10. the phenomenon that explains how the continents moved into their current positions
  5. 11. layer of hot solid material between the crust and core
  6. 12. boundary that involves plates sliding past one another
  7. 13. volcanoes can form here and it is not on a plate boundary
  8. 15. layer of rock that forms the earth's outer surface
Down
  1. 1. a ridged layer made up of the uppermost part of the mantle and crust
  2. 3. events that can be found on all types of boundaries
  3. 4. process by which oceanic crust sinks back into the mantle at a convergent boundary
  4. 6. boundary where two plates move toward each other
  5. 7. these form when two continental plates collide
  6. 9. the scientist who came up with the theory of seafloor spreading
  7. 14. forms when an oceanic plate subducts under a continental plate