Answer» Correct Answer - Option 1 : Helium and Hydrogen.
The correct answer is Helium and Hydrogen. - The exosphere is the outermost layer of the atmosphere.
- It starts above the ionosphere at a height of 400 km and stretches up to 10,000 km.
- Light gases like helium and hydrogen float into space from here.
- The temperature in this layer gradually increases through the layer as the sunlight invades it.
- Gases in various layers of the atmosphere:
- Troposphere - Nitrogen (78.08%), oxygen (20.95% ), argon (0.93% ), carbon dioxide (0.04%), methane, dinitrogenoxide, carbon monoxide, ozone, sulphate, nitrogen dioxide, and hydroxyl radical.
- Stratosphere - Nitrogen, oxygen, argon, and trace elements like neon and helium.
- Mesosphere - Nitrogen, oxygen, and ozone.
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