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Across 4. A traveller visiting the coral reefs 6. Activity on the water 7. Device used for fishing. 9. Deep sea salvage. 12. Hazordous waste released by shipping accidents. 16. Chemicals used to enhance growth. 20. To remove the color from, as by means of chemical agents or sunlight. 21. Excretions through the pipe system. 22. The meteorological conditions, including temperature, precipitation, and wind, that characteristically prevail in a particular region.

Down 1. Chemicals that harm the water environment. 2. Explosives used for fishing. 3. One whose occupation is to catch images of the reef. 5. An item that reminds one of a place or event. 8. The natural process of breaking off sediment. 10. Location of Great Barrier Reef 11. Causing an undesirable state of the environment. 13. Skin divers using a snorkel. 14. _________ runoffs that cause sediment in the reefs. 15. Pieces of debris eroded by the water. 17. The act, occupation, or sport of catching fish. 18. Main component in the reef 19. A strip or ridge of rocks, sand, or coral that rises to or near the surface of a body of water.