
Coral • Water temperature must be at least 25 degrees Celsius to survive!!! • The Great Barrier Reef in Australia can be seen from outer space! • The remains of billions of individual creatures! • Some coral reefs are 300 metres thick • Some coral reefs are 25000 years old!
Videos • http://channel.nationalgeographic.com/series/explorer/3092/Overview#tab-Overview • http://www.youtube.com/watch?v=Dm98n3908QM sessile? • http://www.youtube.com/watch?v=WQLfsHMc6jQ reproduction • http://www.youtube.com/watch?v=eyCigZ_bsTM