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| Earliest geochemical evidence of plate tectonics found in 3.8-billion-year-old crystal Posted: 21 Apr 2022 10:10 AM PDT Plate tectonics may be unique to Earth and may be an essential characteristic of habitable planets. Estimates for its onset range from over 4 billion years ago to just 800 million years ago. A new study reports evidence of a transition in multiple locations around the world, 3.8-3.6 billion years ago, from stable 'protocrust' to pressures and processes that look a lot like modern subduction, suggesting a time when plates first got moving. |
| Prehistoric people created art by firelight, new research reveals Posted: 20 Apr 2022 12:15 PM PDT Stones that were incised with artistic designs around 15,000 years ago have patterns of heat damage which suggests they were carved close to the flickering light of a fire, a new study has found. |
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