アメリカ自然史博物館のインスタグラム(amnh) - 3月28日 06時54分

This rock records a time from the Earth's distant past when evolving life profoundly influenced the planet's evolution. The oxygen that is now in the Earth's atmosphere was not there at the beginning. Early life began to generate oxygen by converting the Sun's energy into food. That caused the iron that was dissolved in the oceans to precipitate out as iron oxide minerals. This rock, with its layers of red jasper and iron magnetite, was formed billions of years ago as part of that process. It is a reminder that life made our atmosphere breathable. #MineralMonday

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