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School Project - Great Barrier Reef
Transcript of School Project - Great Barrier Reef
A Wonder of the World
The Great B
is the largest living structure on Earth,
History and Discovery
The Great Barrier Reef is one of the seven wonders of the natural world.
The Great Barrier Reef is even bigger than the Great Wall of China
and is the biggest group of coral reefs in the world. Over 100 types of coral can be found in an acre of the reef.
The Great Barrier Reef is about 1,250 miles long, and is more than 2,000 kilometers.
The Great Barrier Reef is the only living thing visible from space
The reef has 600 islands,
the world's biggest collection of coral, coral sponges, mollusks and rays,
and contains about 3,400 reefs that make it up.
Some giant clams in the reef are over 120 years old.
The Great Barrier Reef has approximately...
2,800 types of fish
400 kinds of coral
4,000 species of mollusks
251 kinds of birds
15 types of sea snake
6 species of sea turtles
There are thousands of species of marine life in the reef, and over 70 types of habitats.
400 species of polyps
Some corals are one organism, but most corals in the Great Barrier Reef are made up of hundreds or thousands of small animals.
They're called polyps
"Great Barrier Reef" World Book encyclopedia 2001
"Worrisome Measure of Decline at Great Barrier Reef" New York Times article by Emma Bryce. Publ
d October 1, 2012
The coral then provides food and shelter for other reef creatures.
That's animal life.
The coral grows when new polyps grow on the skeletons of old polyps
or when red algae grows and crusts over shells, sand and coral to the existing reef, enlarging it.
The east coast of Australia was probably first sighted about 1522, by a Portuguese expedition led by Cristovao de Mendonca
The east coast of Australia is where the reef is
The Great Barrier Reef most likely began forming 500,000 years ago.
Geologists have found ancient coral in the reef that old
James Cook on the Endeavor sailed the length of the Great Barrier Reef in 1770
The voyage didn't do very much, but it proved to the world that the reef exists
Philip Parker King accurately charted the northern Great Barrier Reef for the first time
The reef has declined since 1985, but if steps are not taken to prevent it from declining more, it is expected to go down 5 to 10 percent in the next ten years
The amount of decline was surprising,
but 42% of it is attributed to crown of thorns starfish
The crown of thorns starfish population has increased, and they are destroying the reef...
...but a study showed that if the starfish are stopped the coral could regrow.
Overfishing and bleaching have also damaged the reef
There has been work to protect the Great Barrier Reef
The reef became a national park in 1975
And a World Heritage site in 1961
People are working to remove pollution from the reef and deal with climate change
Over one third of the Great Barrier Reef is completely protected from fishing and other activities that remove animals
It's a habitat for dugongs and the large sea turtle, which are both endangered.
Humpback whales and bottlenose dolphins live in the reef and are protected species.
This is the Great Barrier Reef
Thanks for Watching!