Australia's Great Barrier Reef | beautiful underwater nature | Scuba Diving the Ribbon Reefs HD

Explore One of the Most Pristine Coral Reefs in the World | National Geographic

Check out these quick facts about coral reefs: – Coral have growth rings, just like trees! – The first coral reefs formed on Earth 240 million years ago. That’s before the dinosaurs were alive! – There are more than 800 different types of hard coral around the world. – The Great Barrier Reef is the largest reef system on Earth. You can even see it from space! Studies show that some corals can live for up to 5,000 years, making them the longest living animals on Earth. #saltwateraquarium #exoticf