Across
- 3. the plates that move away from each other
- 4. about 100km thick, it's also cool & rigid
- 6. represents movements of the earth's interior
- 9. a break in the structure or layers in a rock
- 12. Great Rift Valley is in this continent
- 17. longest era in earth's history
- 18. process of wearing away of rock
- 19. type of climate that is extremely hot and dry
- 20. name of original supercontinent
- 22. means that rocks can change shape without breaking
Down
- 1. imaginary line that splits the earth in two
- 2. date line line of longitude 180deg
- 5. continent that contained southern hemisphere
- 7. layer of hot, solid rock
- 8. folds where plates push each other down
- 10. era when the supercontinent began to break apart
- 11. rock that is made up of layers of sediment
- 13. also called age of the reptiles
- 14. plate entirely under water
- 15. remains of buried plans or animals
- 16. a major life zone
- 21. a key used for a map