The Earth puzzle

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