Moeraki Boulders, giant stone spheres on a New Zealand beach, took up to 5.5 million years to grow
The Moeraki Boulders on New Zealand's Otago coast are seafloor concretions; the largest, 2 meters wide, grew for 4 to 5.5 million years.
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The Moeraki Boulders on New Zealand's Otago coast are seafloor concretions; the largest, 2 meters wide, grew for 4 to 5.5 million years.
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