The pie chart represents the composition of air on Earth. Identify the correct proportion of each gas in the air.

methane
nitrogen
hydrogen
oxygen
ammonia
trace gases

The correct proportion of each gas in the air is as follows:

- Methane: Small trace amounts (less than 0.0002%)
- Nitrogen: Approximately 78%
- Hydrogen: Very small trace amounts (less than 0.00005%)
- Oxygen: Approximately 21%
- Ammonia: Very small trace amounts (less than 0.00001%)
- Trace gases: Various gases such as carbon dioxide, argon, neon, helium, etc., make up the remaining fraction, collectively referred to as trace gases.