Analysis of ancient raindrop pits offers clues about early Earth atmosphere

(Phys.org)—Researchers from NASA's Ames Research Center have presented their findings regarding the study of raindrop imprints left behind in volcanic ash approximately 2.7 billion years ago, at the American Geophysical Union annual meeting in San Francisco. By studying the crater size of the drops left behind, the researchers reported that they have been able to estimate the density of the atmosphere at the time the drops fell.

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