What Is a Coral Reef?
This term refers to creatures that build reefs using tiny living beings called polyps and calcium carbonate.
What is a coral reef?
Most coral reefs are found in this kind of warm, clear water.
What are shallow, tropical waters?
Fish that take shelter among reef coral and famously clown around.
What is the clownfish?
Coral reefs often called this, due to their amazing biodiversity.
What are the rainforests of the sea?
When dismissed as rocks or plants, these organisms are actually this.
What are animals?
Coral reefs are actually this type of ecosystem, rich in biodiversity.
What is an underwater ecosystem?
This reef system in Australia is the largest on Earth and visible from space.
What is the Great Barrier Reef?
This shelled mollusk and this striped reptile often appear in reef videos.
What are giant clams and sea turtles?
About this percentage of all marine species rely on reefs.
What is roughly 25%?
This color‑losing event occurs when corals expel their algae, often due to rising water temperature.
What is coral bleaching?
These tiny animals live in colonies and build reefs by secreting limestone.
What are coral polyps?
Famous reef found in Brazil and French Guiana.
What is the Amazon Reef?
These two animals are known for hiding in crevices and changing shape.
What are octopus and eels?
Coral reef structures help protect coastal areas from this ocean-related hazard.
What are waves and storms?
This common skincare product ingredient, when washed off, can harm corals.
What is oxybenzone in sunscreen?
Like trees, corals have this that shows their age.
What are growth rings?
Reef types include fringing, barrier, and this third classification.
What are atoll reefs?
Parrotfish are noted for this unique feeding behavior.
: What is grazing on algae and coral surfaces?
These substances derived from reef organisms are used in medicines for conditions like cancer and heart disease.
What are chemical compounds from reef species?
Reef restoration often uses steel “Reef Stars” to do this from broken fragments.
What is to provide surfaces for coral fragments to regrow?
Coral reefs first appeared around this many million years ago, during the Early Ordovician.
What is about 485 million years ago?
Great Barrier Reef stretches over this approximate length in kilometers.
What is about 2,300 km?
Algae living inside coral tissues are called this, helping with food and color.
What are zooxanthellae?
In 2020, the global economic value of coral reefs was estimated to be up to this trillion‑USD amount.
What is about 9.9 trillion?
This method grows coral fragments either in ocean nurseries or labs before transplanting them.
What is coral gardening?