Science

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Across
  1. 2. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
  2. 5. Scientist who developed the Theory of the Continental Drift
  3. 6. A crack in the Earth's lithosphere
  4. 8. pieces of the earths lithosphere are still in motion caused by convection currents in the mantle
  5. 10. two plates move toward each other
  6. 12. Name of the landmass that broke apart about 225 million years ago
  7. 13. cause the plates to move
  8. 15. Dense ball of solid material at the center of he Earth
Down
  1. 1. a rigid layer made up of the uppermost part of the mantle and the crust
  2. 3. deep valley where two plates seperate
  3. 4. molten materials add new oceanic crust to the sea floor
  4. 7. Thickest layer of the Earth
  5. 9. layer of iron and nickel that surrounds the inner core of the Earth
  6. 11. two plates grind against each other moving them apart
  7. 14. a deep depression in the ocean floor,