Tiny meteorites no larger than grains of sand hold new clues about the atmosphere on ancient Earth, according to scientists.

Iron micrometeorites, like seen here under a microscope, can provide new clues about the composition
of the Earth’s upper atmosphere 2.7 billion years ago [Credit: Andrew Tomkins]Iron micrometeorites found in ancient soils suggest carbon dioxide made up 25 to 50 percent of Earth’s atmosphere 2.7 billion years…

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Source: archeo