Tic Tac Know Project

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Across
  1. 1. the undersea mountain chain where new ocean floor is produced; a divergent plate boundary
  2. 3. A plate boundary where two plates move toward each other
  3. 7. Dense ball of solid material at the center of the Earth
  4. 9. A plate boundary where two plates move away from each other
  5. 11. The process by which molten material adds new oceanic crust to the ocean floor
  6. 12. A break or crack in the Earth's lithosphere along which rocks move
  7. 16. German Scientist who developed the Theory of the Continental Drift in 1912.
  8. 17. The layer of rock that forms the Earth's outer surface
  9. 18. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
  10. 20. A plate boundary where two plates grind against each other, moving it different directions
Down
  1. 2. Cause the plates to move; between the lithosphere and the asthenosphere
  2. 4. Theory that pieces of the Earth's lithosphere are in motion, driven by convection currents in the mantle
  3. 5. Alfred Wegener's hypothesis that the continents were once one huge landmass but have since then drifted apart
  4. 6. A rigid layer made up of the uppermost part of the mantle and the crust
  5. 8. The name of the single landmass that broke apart about 225 million years ago
  6. 10. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
  7. 13. A soft layer of the mantle on which the lithosphere floats
  8. 14. A deep valley where two plates move apart
  9. 15. A layer of molten iron and nickel that surrounds the inner core of the Earth
  10. 19. A deep canyon on the ocean floor