Is 285.0 square millimeters as big as The Great Barrier Reef?
It's about 0.0000000000000008 times as big as The Great Barrier Reef
The size of The Great Barrier Reef is about 348,000,000,000,000,000.000000000000000000000 square millimeters.
(a.k.a. Barrier Reef) (Coral Sea, off Queensland, Australia) (approximate)
The Great Barrier Reef, the largest such reef in the world, covers about 348,000,000,000,000,000.000000000000000000000 square millimeters. Reefs, such as the Great Barrier, grow in diameter at a rate of 1 to 3 cm per year.
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