Across
- 5. These are created when magma cools immediately once erupted from the ridge.
- 9. Movement in a gas or liquid in which the warmer parts move up and the cooler parts move down.
- 12. The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
- 16. What landform is made when two continental plates collide?
- 17. This part of the Earth contains our crust and the upper part of the mantle.
- 18. ________ theorized the continents moved.
- 19. What did scientists use to map out the sea floor?
Down
- 1. A break in the Earth's crust.
- 2. ______ dense materials rise.
- 3. Stitched looking mountain ranges on the seafloor.
- 4. This boundary slides.
- 6. Changes in what affect the ocean floor?
- 7. The ocean floor is brand new every 200 _____ years.
- 8. The supercontinent that formed about 200 million years ago.
- 9. Subduction and seafloor spreading act like a ______.
- 10. Energy caused by the sudden breaking of rock within the earth or an explosion.
- 11. The _______ has convection currents which cause continental drift.
- 13. The crust is ________ dense farther from the mid- ocean ridge.
- 14. Where does oceanic crust bend downward in the ocean floor?
- 15. This boundary divides.