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