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     • Coral reefs form at depths not exceeding 25 metres, and need warm water between 20 to 28 degrees Celsius. Reefs grow faster in clear water that allows sunlight to penetrate. A coral reef is made up of millions of coral polyps. These are tiny animals, but they contain plants called algae. The algae convert sunlight into energy for the reef itself.
     www.bbc.co.uk/bitesize/guides/z2ntk7h/revision/4

     Coral reefs - Ecosystems - OCR - GCSE Geography Revision ...

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   What is a coral reef?

   • A coral reef is a term used to describe the collective structure of hard corals that help shape a coral reef ecosystem. “A coral reef is a reef whose main structure is made by living organisms, in this case corals,” said Torres-Pérez. “A coral reef will always be a reef, but not all reefs are coral reefs.”

   What is a Coral Reef? - NASA

   www.nasa.gov/general/what-is-a-coral-reef/

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   What is a coral reef tutorial?

   • The tutorial is an overview of the biology of and threats to coral reefs, as well as efforts being made to conserve and protect them. It includes images and animations. The Roadmap to Resources complements the tutorial. It directs you to specific online coral data and information from NOAA.

   Corals Tutorial: Corals Tutorial: - NOAA's National Ocean Service

   oceanservice.noaa.gov/education/tutorial_corals/welcome.html

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   Why do people rely on coral reefs?

   • Thousands of species rely on reefs for survival. Millions of people all over the world also depend on coral reefs for food, protection and jobs. This tutorial is an overview of the biology of and threats to coral reefs, as well as efforts being made to conserve and protect them. It includes images, animations, and videos.

   Corals Tutorial: Corals Tutorial: - NOAA's National Ocean Service

   oceanservice.noaa.gov/education/tutorial_corals/welcome.html

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   Why do coral reefs grow faster in clear water?

   • Reefs grow faster in clear water that allows sunlight to penetrate. A coral reef is made up of millions of coral polyps. These are tiny animals, but they contain plants called algae. The algae convert sunlight into energy for the reef itself. The coral polyps make hard calcium carbonate which builds up over thousands of years to form reefs.

   Coral reefs - Ecosystems - OCR - GCSE Geography Revision - OCR - BBC

   www.bbc.co.uk/bitesize/guides/z2ntk7h/revision/4

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   Why are coral reefs important?

   • Coral reefs cover only 1% of the ocean floor, but support an estimated 25% of all marine life in the ocean, earning them the moniker ‘rainforest of the sea.’ They also play a critical role for coastal communities; preventing coastal erosion, protecting coastlines from hurricane damage, and generating $36 billion in annual income worldwide.

   What is a Coral Reef? - NASA

   www.nasa.gov/general/what-is-a-coral-reef/

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   What are some facts about coral reefs?

   • Quick facts about coral reefs… – Coral have growth rings, just like trees! – The first coral reefs formed on Earth 240 million years ago. That’s before the dinosaurs were alive! – Most coral reefs today are between 5,000 and 10,000 years old. – There are more than 800 different types of hard coral around the world.

   Coral reef facts for kids! - National Geographic Kids

   www.natgeokids.com/uk/discover/geography/general-geography/coral-reef-facts/

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3. www.nasa.gov › general › what-is-a-coral-reefWhat is a Coral Reef? - NASA

   www.nasa.gov › general › what-is-a-coral-reef

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   Oct 15, 2024 · A coral reef is a term used to describe the collective structure of hard corals that help shape a coral reef ecosystem. “A coral reef is a reef whose main structure is made by living organisms, in this case corals,” said Torres-Pérez.

4. www.natgeokids.com › coral-reef-factsCoral reef facts for kids! - National Geographic Kids

   www.natgeokids.com › coral-reef-facts

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   Learn about coral reefs in our coral reef facts for kids. What are coral reefs and where are they found? What lives inside coral reefs?

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5. www.bbc.co.uk › bitesize › guidesCoral reefs - Ecosystems - OCR - GCSE Geography Revision ...

   www.bbc.co.uk › bitesize › guides

   What is a coral reef? Coral reefs form at depths not exceeding 25 metres, and need warm water between 20 to 28 degrees Celsius. Reefs grow faster in clear water that allows sunlight to...

6. Videos

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     Coral Reefs 101 | National Geographic

     7 Nov 2017

     2M views

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     24:45

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     Lets Learn About Coral reefs

     5 Mar 2023

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     4:43

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     What Are Coral Reefs And What's Their Purpose?

     6 Jul 2014

     670.5K views

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7. education.nationalgeographic.org › coral-reefsCoral Reefs - National Geographic Society

   education.nationalgeographic.org › coral-reefs

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   Jul 18, 2024 · Learn the risks our world's coral reefs are facing and what they mean for our future and the future of the ocean.

8. www.nhm.ac.uk › what-is-a-coral-reefWhat is a coral reef? - Natural History Museum

   www.nhm.ac.uk › what-is-a-coral-reef

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   Coral reefs are made up of colonies of hundreds to thousands of tiny individual corals, called polyps. These marine invertebrate animals have hard exoskeletons made of calcium carbonate, and are sessile, meaning permanently fixed in one place.

9. earth.org › what-are-coral-reefsWhat Are Coral Reefs and Why Are They So Important?

   earth.org › what-are-coral-reefs

   Sep 5, 2022 · What Are Coral Reefs? A coral reef is a colony of hundreds of thousands of individual animals called coral polyps. These form when free-swimming coral larvae get attached to rocks or other hard surfaces underwater, mainly along the coastlines of islands and continents.

10. oceanservice.noaa.gov › education › tutorial_coralsCorals Tutorial: Corals Tutorial: - NOAA's National Ocean Service

    oceanservice.noaa.gov › education › tutorial_corals

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    This tutorial is an overview of the biology of and threats to coral reefs, as well as efforts being made to conserve and protect them. It includes images, animations, and videos. Coral reefs are some of the most diverse ecosystems in the world.