AP Environmental Science / Unit 4: Earth Systems and Resources
4.4 Earth's Atmosphere
Notes
Layers (lowest up): troposphere (weather), stratosphere (ozone layer), mesosphere, thermosphere, exosphere.
- Composition: about 78% $\mathrm{N_2}$, 21% $\mathrm{O_2}$, about 1% argon, small amounts of $\mathrm{CO_2}$.
Practice
Weather happens in the:
Lowest layer.
The ozone layer is in the:
Absorbs UV.
The most abundant gas in the atmosphere:
About 78%.
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