Astronomy › Section G · The solar system and Earth › Topic G.6
Earth's atmosphere
We live at the bottom of a thin ocean of air. Its layers, its mix of gases and its slow changes over time are what make Earth habitable, and comparing it with the air of Venus and Mars shows how unusual it is.
In this topic
- An ocean of air
- Worked example: weighing the atmosphere
- The troposphere
- The upper layers
- The ozone layer
- What the air is made of
- Earth's hidden volatiles
- Worked example: boiling the oceans
- Where the air came from, and where it goes
- Weather, climate and ice ages
- Common mistakes to avoid
- Key takeaways
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