Little radiation is absorbed in the ____________________ (between about 55 and 80 kilometers above Earth's surface), and the thin air is extremely cold.
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Q2: Life could not have emerged in an
Q3: A solution that is neither acidic nor
Q4: During the evolution of Earth's atmosphere, when
Q5: _ are particles or particulates that are
Q6: Earth's initial atmosphere composition 4.6 billion years
Q8: A first rapid increase of oxygen in
Q9: The layer of air closest to Earth,
Q10: _ were the earliest photosynthetic life-forms on
Q11: A rapid rise in oxygen levels occurred
Q12: The pressure exerted by air is the
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