Plate Tectonics
Across
- 4. One giant land mass, 200 million years ago
- 5. A crack, split, or break in something
- 6. Long, narrow ditch
- 7. Proposed theory about ocean-floor material
- 10. A submarine ridge system
- 11. Used to join or strengthen things
- 15. Where two plates collide and the denser plate subducts under the less dense plate
- 16. Hot fluid similar to lava
- 17. Type of plate boundary
- 18. Outer part of earth, inc. the crust and mantle
Down
- 1. The gradual movement of continents through geologic time
- 2. Type of plate boundary
- 3. Type of plate boundary
- 8. ______ spreading
- 9. The upper layer of earth's mantle, below the lithosphere
- 12. Hard inner/outer layer of earth
- 13. The movement caused within a fluid caused by the tendency of hotter fluid to rise and cooler material to sinkdense Closely compacted in substance
- 14. Created Continental Drift Theory
- 16. Capable of being attracted by a magnet