Plate Tectonic, Volcano, and Earthquakes

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Across
  1. 8. all of the crust as well as the upper, rigid part of the mantle.
  2. 9. third layer of earth
  3. 12. a place where sea-floor spreading takes place.
  4. 13. the process of new oceanic crust forming as magma rises toward the surface and solidifies.
  5. 15. second layer of earth
Down
  1. 1. center of the earth
  2. 2. the boundary between two tectonic plates that are moving away from each other.
  3. 3. thin layer of gas surrounding earth
  4. 4. first layer of the earth
  5. 5. the boundary formed by the collision of two tectonic plates
  6. 6. occurs when two tectonic plates collide, and one plate moves under the other and sinks into the mantle.
  7. 7. a block of lithosphere that consists of the crust and the rigid, outermost part of the mantle.
  8. 10. the hypothesis that the continents once formed a single land mass, broke up, and drifted to their present locations.
  9. 11. the landmass that existed when all continents were joined.
  10. 14. places where tectonic plates meet.