Choice Board Assignment Crossword Puzzle

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Across
  1. 4. molten material above the surface of the Earth
  2. 7. are formed at divergent boundaries and mainly at mid ocean ridge
  3. 8. plates that flow independently over the mantle
  4. 10. the mostly-solid bulk of Earth's interior
  5. 13. the only liquid layer of the Earth that contains iron and nickel
  6. 15. the layer right beneath the lithosphere
  7. 16. the scientist who came up with the theory of continental drift
  8. 18. the rigid outer part of the Earth that consists of the crust and upper mantle
  9. 19. a supercontinent that existed about 250 million years ago
  10. 20. molten material below the surface of the Earth
Down
  1. 1. the center of the Earth that is as hot as the Sun
  2. 2. 2 plates that slide past each other
  3. 3. when the dense plate sinks into the mantle
  4. 5. lowland region formed by a divergent boundary
  5. 6. theory that continents slowly move across the Earth's surface
  6. 9. 2 plates that move towards each other
  7. 11. the top and thinnest layer of the Earth
  8. 12. formation of new seafloor when magma comes up at mid-ocean ridge
  9. 14. plates of the Earth's surface that constantly move
  10. 17. 2 plates that move away from each other