Nature · 1
What is the Great Barrier Reef made of?
Answer
Coral polyps
The Great Barrier Reef is built by tiny colonial animals called coral polyps that secrete calcium carbonate skeletons to create the reef structure. Over thousands of years, these polyps accumulate to form massive structures visible from space. The reef supports over 1,500 fish species, 400 coral types, and countless other organisms, making it one of Earth's most biodiverse ecosystems.
💡 Did you know?
The Great Barrier Reef is visible from space and supports 1,500+ fish species.
Other options people guess
- Stone
- Algae
- Sand
Topics
- coral
- ocean
- Australia
Know your nature trivia?
Play a free Nature quiz and see how many you get right — no signup needed to start.
More Nature facts
Nature
Why does a pistol shrimp depend on a goby fish to alert it to nearby predators?
Goby fish stand guard outside pistol shrimp burrows, watching for danger while half-blind shrimp digs. Both sleep in the same shelter nightly.
Nature
Which burrowing marsupial is famous for producing distinctly cube-shaped droppings?
Wombats produce cube-shaped droppings that don't roll away, marking territory on logs and rocks where predators will notice them.
Nature
Lacking an ink sac like true squid, what does the vampire squid release instead to help it vanish from predators?
Vampire squid turns itself inside-out like a living parka, cloaking predators in a mucus cloud while it escapes undetected.
Nature
What do photosynthetic organisms use from the atmosphere to produce food?
One mature tree produces enough oxygen yearly for two people to breathe.
Nature
What percentage of Earth's land is covered by forest?
Earth loses forest equal to 27 football fields every minute to deforestation.
Nature
What type of ecosystem is characterized by very low rainfall and sparse vegetation?
Deserts cover 33% of Earth's land yet support organisms specially adapted to extremes.