Exploring Oceans: Great Barrier Reef (video)

1.) The Great Barrier Reef is considered one of the largest living structure on earth

2.) Coral extracts calcium carbonate from the surrounding water to make solid

3.) Red algae impacts the structure of a coral by acting like pink glue by coating it with sheets of calcium carbonate.

4.) The Great Barrier Reef was established a national park in 1975

5.) Over 33 percent of the Great Barrier Reef is protected from fishing.

6.) Many scientists believe the current reef is 20 thousand years old, and the ancient reef is half a million years old.