plate tectonics and continental drift

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Across
  1. 1. the layer of rock that forms earths outer core
  2. 5. a trace of an ancient organism that has been preserved in a rock for up to millions of years
  3. 6. a plate boundary where two plates move away from eachother
  4. 8. a plate boundary where 2 plates move towards eachother
  5. 10. A break or crack in the earths lithosphere along which the rocks move
  6. 11. a plate boundary where 2 plates move past each other in opposite directions
  7. 13. the layer of hot solid material between earths crust and core
  8. 15. the hypothesis that the continents have slowly moved across earths surface
  9. 16. the theory that pieces of earths lithosphere are in constant motion driven by convection currents in the mantle
  10. 17. a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
Down
  1. 2. the process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary
  2. 3. an undersea mountain chain where new ocean floor is produced
  3. 4. a layer of molten lava and nickel that surrounds the inner core of earth
  4. 7. A deep valley that forms where 2 plates move apart
  5. 9. a dense sphere of solid iron and nickel at the center of the earth
  6. 12. the name of the single landmass that broke apart 200 million years ago and gave rise to todays continents
  7. 14. a rigid layer made up of the uppermost part of the mantle
  8. 18. the soft layer of the mantle on which the lithosphere floats