| 21. | Scientists believe the Great Barrier Reef began forming about 500, 000 years ago.
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| 22. | Tourism is one of the major industries in the Great Barrier Reef region.
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| 23. | It would have looked much like the present-day Great Barrier Reef of Australia.
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| 24. | The president is now off to tour the Great Barrier Reef.
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| 25. | Busst's other major battle involved protecting the Great Barrier Reef from Continental Shelf.
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| 26. | The adventurous, of course, must explore the Great Barrier Reef.
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| 27. | Thus, there is no need to go to Mauritius or the Great Barrier Reef.
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| 28. | In 1901 with Charles Hedley he examined the Queensland coast and Great Barrier Reef.
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| 29. | In 1981, the Great Barrier Reef was declared a World Heritage Site by UNESCO.
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| 30. | These were used to carry out a photographic survey of the Great Barrier Reef.
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