Coral reefs are sea structures made of living organisms called coral polyps that spawn eggs and help the reef gain a stable structure over time. The Great Barrier Reef off the coast of Australia can be seen from space and is home to brain coral, fire coral, fish, jellyfish, and the crown of thorns starfish. People use the Great Barrier Reef for fishing, snorkeling, and scuba diving but also threaten it through overfishing, littering, and illegal logging. Efforts are underway to preserve the reef by reducing threats like the crown of thorns starfish and cleaning up litter.

1. By Tom and Justin 3/4C