Quiz · The Vanishing World of Coral Reefs

Question 1What is the main purpose of the speaker in this talk?

To explain how tiny polyps build underwater cities To promote tourism in tropical coastal communities To describe the threats facing coral reefs and efforts to save them To argue that all fishing near reefs should be banned

Question 2According to the talk, what happens to coral during the process called bleaching?

It expels the colourful algae and turns a ghostly white It grows much faster in the warmer sea water It moves slowly into deeper and darker water It releases stored carbon back into the ocean

Question 3How much of the world's coral reefs has been lost in the past three decades?

Less than one percent of them About a quarter of them Nearly all of them Roughly half of them