Earth Science – Unit 9: Earth’s Atmosphere. Lesson 1:Evolution of the Atmosphere – Flashcards
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What force keeps our atmosphere from floating out into space?
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Gravity.
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In the paleoatmosphere, the primary gases were _____.
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carbon dioxide, nitrogen, and water vapor.
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Which of the following factors caused the early atmosphere to become thicker?
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volcanic outgassing and meteorite and comet impacts.
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The earth has fewer meteorite impacts because_____.
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Of the earth's atmosphere.
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The first major source of oxygen gas was _____.
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cyanobacteria.
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The atmosphere has many roles, including:
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provides gases for respiration and photosynthesis provides protection from UV radiation and meteorites stabilizes a habitable temperature
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Most life would not be possible without our unique atmosphere.
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True.
