Grade 7 Social Final Revision

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