Plate Tectonics Crossword

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Across
  1. 2. A weak spot in the crust where magma has come to the surface
  2. 4. extremely deep areas in the ocean that are created by a subducting plate
  3. 7. process in which two plates collide and the denser ocean plate descends below the other
  4. 11. The boundary between tectonic plates that are sliding past each other horizontally
  5. 12. thinner, more dense, crust making ocean floor
  6. 14. The semi-liquid layer of the mantle on which the lithosphere floats.
  7. 15. the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
  8. 17. term for the super continent which contained all the plates together
  9. 18. The boundary between two tectonic plates that are moving away from each other
Down
  1. 1. The portion of the earth's crust that is less dense than oceanic crust, and is contains earth's land masses.
  2. 3. Proposed the continental drift theory in the 1900s
  3. 5. The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
  4. 6. an underwater mountain range made at divergent plate boundaries
  5. 8. The theory that the earth is broken into plates and are in motion due to convection currents in the asthenosphere (upper mantle)
  6. 9. The boundary formed by the collision of two plates
  7. 10. The process by which new oceanic crust forms as magma rises towards the surface and solidifies at divergeny boundaries.
  8. 13. current a current caused by the rising of heated fluid and sinking of cooled fluid believed to drive plate movement in the mantle of the earth
  9. 16. A shaking or sliding of the ground. It is caused by the sudden movement of masses of rock along a fault.