Atmosphere Dominant Gases
Earth's surface atmosphere is primarily composed of two major gases:
- Nitrogen ($N_2$): Constitutes approximately 78% of the atmosphere.
- Oxygen ($O_2$): Constitutes approximately 21% of the atmosphere.
Together, Nitrogen ($N_2$) and Oxygen ($O_2$) make up roughly 99% of the Earth's dry atmosphere, making them the dominant gases.
Therefore, the two gases that dominate Earth's surface atmosphere are Nitrogen ($N_2$) and Oxygen ($O_2$).
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