Question

the Great barrier reef is made up of which material?
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Answer 1

Answer:

A coral reef is made of thin layers of calcium carbonate

Coral polyps form a living mat over a calcium carbonate skeleton.

Answer 2

Answer:

The Great Barrier Reef is the largest living ecosystem in the world. It has been around for many millennia and is continually growing and changing. It is a network that spans across 2,600km and is made up of corals, seagrass, islands, and cays that is make up the Great Barrier Reef Marine Park.

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Explanation:

A coral reef is made of thin layers of calcium carbonate

Coral polyps form a living mat over a calcium carbonate skeleton.