Earthquakes and Volcanoes

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