Great Barrier Reef
THE ANSWER
"Aerial View of Great Barrier Reef (Ank Kumar) 02" — Photo by Ank Kumar / Wikimedia Commons / CC BY-SA 4.0
The largest living structure visible from the heavens.
This massive marine ecosystem is composed of billions of tiny organisms. It is a delicate and vibrant underwater world.
Explanation
Did you know?
It is larger in size than the entire United Kingdom, Switzerland, and Holland combined.
The 5 Clues
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“A calcium skeleton of planetary proportions.”
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“It is a silent, growing wall beneath the tides.”
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“Visible from orbital altitude.”
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“Located off the north-eastern coast of Queensland.”
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“The world's largest coral reef system.”
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