Tic Tac Project

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Across
  1. 4. The process by which molten material adds new oceanic crust to the ocean floor
  2. 6. A layer of molten iron and nickel that surrounds the inner core of the Earth
  3. 9. A rigid layer made up of the uppermost part of the mantle and the crust
  4. 10. The name of the single landmass that broke apart about 225 million years ago
  5. 11. A soft layer of the mantle on which the lithosphere floats
  6. 13. Theory that pieces of the Earth's lithosphere are in motion,driven by convection currents in the mantle
  7. 14. A deep canyon on the ocean floor
  8. 15. the layer of rock that forms the Earth's outer surface
Down
  1. 1. Cause the plates to move; between the lithosphere and the asthenosphere
  2. 2. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary
  3. 3. A break or crack in the Earth's lithosphere along which rocks move
  4. 5. German Scientist who developed the Theory of the Continental Drift in 1912.
  5. 7. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
  6. 8. The thickest layer of the Earth
  7. 12. Dense ball of solid material at the center of he Earth