Earth's oldest-known crater discovered in outback WA is 3.47 billion years old, study finds
The discovery of a 3.47-billion-year-old crater in WA's Pilbara region pushes back the age of the earliest-known impact site on Earth by more than one billion years.
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Marble Caves: Chile's ethereal turquoise caverns with 'mineral ice cream' on the walls
The Marble Caves are natural rock formations with ... the [caves] began," Francisco Hervé Allamand, a professor of geology at Andrés Bello National University in Chile and an honorary fellow ...