gateway 3

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Across
  1. 5. four-pronged concrete structures
  2. 6. encouraging coral reef _____
  3. 10. eg mangroves, to help stabilise coastlines (2 words___-___)
  4. 12. put a limit on; control
  5. 15. constructed to protect coastlines against wave attack by absorbing it
  6. 17. one of the orange words in solf engineering measures (dunes)
  7. 19. low walls constructed 90 ° to the shore
  8. 20. help to break the force of oncoming waves
Down
  1. 1. reduce
  2. 2. Able to be maintained at a certain rate or level
  3. 3. _____ reef
  4. 4. to prevent resources from being destroyed
  5. 7. means controlling the development and change
  6. 8. using sand from an external source to replenish the sand on a depleted beach (2 words____-___)
  7. 9. construction of physical structures to protect coast (2 words____-____)
  8. 11. wire cages usually filled with crushed rocks
  9. 13. a alleviate the problem of land shortage
  10. 14. protecting the coast using natural processes (2 words_____-_____)
  11. 16. a beach found at the east of Singapore(3 words joint together)
  12. 18. a natural hazards related to water