The Earth puzzle

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Across
  1. 4. the sea
  2. 6. a strain by being stretched
  3. 7. sub layer of the earth surface
  4. 12. Rises from the water
  5. 13. emphasize differences
  6. 14. the outside layer of something
Down
  1. 1. earth surface that is not covered by water
  2. 2. a mainland contrasted with islands
  3. 3. Natural elevation of the earth surface
  4. 5. The study of Earth
  5. 8. Shakes the Earth
  6. 9. shows The direction of north
  7. 10. Spits out lava
  8. 11. danger or risk
  9. 15. The planet we live in