“It’s An Incredible Feeling”: Salty Air Bubbles In 1.4-Billion-Year-Old Crystals Reveal Secrets Of Earth’s Early AtmosphereSalt crystals formed when a saline lake dried up 1.4 billion years ago trapped air inside, providing a sample of the atmosphere of the day, before photosynthesis was productive enough to make it oxygen-rich. New techniques have allowed that air to be analyzed accurately,...
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