Sea Under the dear blue sea, there are beautiful underwater cities that are rich in life. They have been around for millions of years and they are communities of ocean creatures that live together in coral reefs Coral looks like rock, but it is actually a huge collection of tiny dear animals called coral polyps The bright colour of coral comes from tiny sea plants called algae, Coral and algae depend on each other to live, Coral may feel tough but it's very sensitive. Today, many coral reefs are dying and there are many reasons why, First of all, the oceans are getting warmer. This kills the algae and so the coral reefs lose their colour and food. Water pollution, fishing with dynamite as well as the careless collection of coral also hurt coral reefs. If we don't take action, all the reefs will die in around 20 years. This will lead thousands of sea creatures to extinction. We can help save the world's coral reefs by joining an environmental organization like Reef Relief. It's worth a try! 1 Coral reefs are... a islands. b towns. Cocean communities. 2 Coral is... a hard. bsoft. C blue, 3 Coral polyps are... a huge plants. b sensitive creatures. c bright-coloured algae. 4 Coral reefs die because... a algae lose their colour. b people fish them. c the oceans' temperature increases.