Earthquakes and Volcanoes (spaces are dashes)

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Across
  1. 3. heat in the mantle that makes the plates move
  2. 5. a volcano comprised of layers of ash
  3. 6. when a piece of crust sinks into the mantle
  4. 7. made of layers of hardened lava
  5. 9. a boundary where two plates come apart
  6. 10. a boundary where two plates come together
  7. 12. pieces of Earth's crust that move slowly
  8. 15. the thickest layer of the earth
  9. 16. the big landmass that was supposedly made of all the continents
Down
  1. 1. named after its shape resembling a warrior's shield
  2. 2. a boundary where two plates shear
  3. 4. wegner's theory that the continents were once pangea
  4. 8. made of iron and molten iron
  5. 11. crack in Earth's crust
  6. 13. when lava and ash are discharged from a vent
  7. 14. came up with the theory of Continental Drift