Plate tectonics Crossword

1234567891011121314151617181920
Across
  1. 1. the ocean floor goes under a deep- ocean trench and then goes back into the mantle
  2. 5. old bones of prehistoric animals
  3. 9. the upper part of the crust and mantle
  4. 13. Earth’s lithosphere or “the eggshell”
  5. 14. German scientist who came up with the theory that all the contintents were joined together
  6. 15. “seams” on the ocean floor
  7. 16. geologist who drew details of the ocean floor based data from the ships
  8. 17. two plates slide past each other
  9. 18. two plates move in the same direction
  10. 19. pieces of Earth’s crust moves apart on land, a deep valley
  11. 20. breaks in earth’s crust
Down
  1. 2. continents moved very slow over Earth’s surface
  2. 3. pulls the older, denser oceanic crust down beneath the trench and back into the mantle.
  3. 4. When a washcloth is placed in water, the water soaks into it. So, the ______ of the washcloth incr
  4. 6. adds more crust to the ocean floor
  5. 7. earth’s plates are in a slow, constant motion by convection currents in the mantle
  6. 8. two plates move in opposite directions
  7. 10. device that uses soundwaves to measure the distance of an object
  8. 11. oceanic crust bends downwards and the ocean floor sinks down into the mantle
  9. 12. supercontinent from about 300 million years