Earth's Layers and Drifting Continents

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Across
  1. 3. The name of the super continent that exited about 300 million years ago.
  2. 4. Valley A deep valley is also called a.
  3. 8. Tectonics Slow motion driven by the convection current makes.
  4. 10. Boundary The plates are sliding.
  5. 11. The ocean floor sinks back into the mantle.
  6. 12. Core This is the 3rd layer from the top to the bottom.
  7. 13. These land feature form at a Convergent Boundary.
  8. 16. There are convection currents in this layer.
  9. 17. Trench Under water canyons, sea-floor spreading ends here.
  10. 20. 2nd layer of Earth from the top, very hot & solid.
Down
  1. 1. Spreading New crust is being added and older crust is being pushed outward
  2. 2. Crust This crust lies beneath the ocean floor.
  3. 5. These create cracks in the crust.
  4. 6. Sits on top of the mantle, 100 km thick.
  5. 7. Boundary The plates collide.
  6. 9. Drift The continents slowly move about 2 centimeters per year.
  7. 14. Boundary The plates are dividing.
  8. 15. Ridge Sea-Floor Spreading begins here.
  9. 18. 5-80 km thick, top layer.
  10. 19. Core Solid metal, mostly iron & nickel, 1,200 km thick.