Earth Science – Unit 9: Earth’s Atmosphere. Lesson 1:Evolution of the Atmosphere

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

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