Coral Reef Quiz: Test Your Knowledge!

Test your knowledge of the world's coral reefs with our interactive coral reef quiz! Can you answer all of the following questions and get a perfect score?

Click on the links that you think best answer each quiz question below. Good luck!

Note: Please enable JavaScript in your web browser to use this interactive coral reef quiz.

1. Coral reefs cover how much of the Earth's surface?
   
   
   1. Less than 1%
   2. 5%
   3. 12%
   4. 50%
2. Coral reefs have been used in the treatment of which disease?
   
   
   1. HIV
   2. Cancer
   3. Cardiovascular disease
   4. All of the above
3. How much do coral reefs contribute to the world’s economy each year?
   
   
   1. USD $3.75
   2. USD $375,000
   3. USD $3.75 million
   4. USD $375 billion
4. What is a major threat to coral reefs?
   
   
   1. Man-eating sharks
   2. Global climate change
   3. Pirates
   4. Asteroids
5. We are in danger of losing what percentage of the world's coral in the next 50 years?
   
   
   1. 6%
   2. 55%
   3. 70%
   4. 100%
6. Which of the following are coral species?
   
   
   1. Bubble
   2. Staghorn
   3. Starburst
   4. All of the above
7. Which of the following species depend on tropical coral reefs?
   
   
   1. Orangutans
   2. Dwarf wedgemussels
   3. Whale sharks
   4. None of the above
8. True or false: Coral reefs are the largest living structure on Earth.
   
   
   1. True
   2. False
9. Because of their amazing diversity of life, coral reefs are often referred to as:
   
   
   1. The ocean's cupboard
   2. Rainforests of the sea
   3. Poseidon's cornucopia
   4. The Sahara of the sea
10. True or false: Coral reefs are doomed – we should give up all hope of protecting them.
    
    
    1. True
    2. False

Coral Reef Quiz Scoring Guide

• 0-2 correct: Coral reef novice – start over at our coral reef homepage
• 3-5 correct: Coral apprentice – freshen up on your coral reef facts.
• 6-8 correct: Reef ranger – Very good! Check out these coral reef videos to brush up your knowledge.
• 9-10 correct: Coral conservationist – You're a real pro! Send a free coral reef e-card to friends and family to show your support of coral reefs.

Help Protect the Earth's Coral Reefs

Help us Rescue the Reef! Be a steward of coral reefs and an investor in the future of our planet.

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Photo © Daniel and Robbie Wisdom

Seastar. © Leslie Richter
See photos of coral reef fish and plants!

Photo slideshow: Coral reef photography (new window)
Watch a slideshow of coral reef fish and plants. Photo © Deb Fugitt
Explore more coral reef ecosystems!

Coral reef video: Republic of Palau
Learn what The Nature Conservancy is doing to protect one of the world's most diverse and fragile coral reefs.
(2.2 MB, Quicktime, new window)
See more coral reef movies!

And Atoll, Pohnpei, Micronesia
© Jez O'Hare
See photos of coral reef fish and plants!

Photo slideshow: Raja Ampat, Indonesia (new window)
Watch a journey of coral reef discovery. Photo © Rod Salm
Explore more coral reef ecosystems!