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Ancient volcano tattooed the Earth with giant rings
Concentric circles of rocky hills and valleys in South Africa tell the story of a billion-year-old collapsed volcano
Concentric circles of rocky hills and valleys in South Africa tell the story of a billion-year-old collapsed volcano
Source: CBSNews
Posted on: Tuesday, Jul 28, 2015, 9:53am
Views: 3207
Posted on: Tuesday, Jul 28, 2015, 9:53am
Views: 3207
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