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million years old. The reef spread southwards due to the lowering of the seabed and the rising sea level. The central and southern part was formed about 2 million years ago. And the parts that are visible today are about 10,000 years old. Types of reefs →Riffs can also be subdivided. First there are reefs that are called deepwater reefs. They are many hundreds of meters under water and the temperature is below 20 degrees. It's cold and dark there. →The second is the Tropical Reef, which is usually associated with the many other types of reefs. Their temperatures are usually over 20 degrees and as the name suggests they are very tropical. They are popular for their clear water and that it is not too deep. Last but not least I would like to talk about the wildlife. →The great barrier reef has a lot of animals. More than 1.500 species of fish, 411 types of hard coral, 134 species of sharks and rays, 6 of the worlds 7 species of threatened marine turtles And more than 30 species of marine mammals →I will show you here pictures of some famous animals. Let's move on to the living together of the species. →Algae get a safe habitat and carbon dioxid →Corals get glucose from the algae →Small fish use the corals as a hiding place and find food →Defend corals against predastors Now you saw the beautiful great barrier reef! But not everything looks so good, because slowly everything is destroyed, and it already started. I will show you why it's treat by human: →Overfishing, Ocean acidification, land reclamation, divers, global warming, cables and oil pipelines and a lot of waste are the reason for the destroying. Finally, I would like to stand up for action against this destruction. Examples would be: →Restriction of fishing Reduction of polloution Ban on the development of new harbours Combat diving patrols Restrict tourism Create artifical reefs Finally, I'd like to show you a video, so you can have a closer look at Great Barrier Reef. ➜ https://youtu.be/JUEEDCPa7e0 Great Barrier Reef official IMAX Trailer- MacGillivray Freeman Thanks for listening. I hope you enjoyed the presentation. Ⓒ The Great Barrier Reef Tea Bezik What is a Reef? Geographical order Discovery&Origin Types of reefs • Wild life- animals living together ● ● ● ● overview ● • Threat from humans Measures ● What is a Reef? Made of rocks or the skeletons of small animals called corals. Geographical order 360 A Papo EL SUPORAMA GA www.AIRP INDONESIA INDIAN OCEAN World Heritage Site AUSTRALIA Canberra PAPUA NEW GUINEA Great Barrier Reef ( PACIFIC OCEAN 2009 EB, Inc. Legend NRM Region Cape York Wet Tropics Burdekin Mackay Whitsunday Fitzroy Burnett Mary AUSTRALIA GBR 0 100 200 300 400 500 Kilometers Great Barrier Reef