Which percentage of Earth's atmosphere is nitrogen (N₂)?

Rationale

78% of Earth's atmosphere is nitrogen (N₂).

Nitrogen makes up approximately 78% of the Earth's atmosphere by volume, making it the most abundant gas in the air we breathe. This significant percentage plays a crucial role in various biological and chemical processes, including the nitrogen cycle.

A (5%) YOUR ANSWER

This percentage is much lower than the actual nitrogen content in the atmosphere. While trace gases and other components may comprise approximately 5% of the atmosphere, nitrogen is overwhelmingly predominant, and a value of 5% does not accurately reflect its abundance.

B (21%) YOUR ANSWER

Though oxygen constitutes about 21% of the Earth's atmosphere, this choice mistakenly attributes that percentage to nitrogen. Nitrogen's share is significantly higher, and while oxygen is essential for life, it is nitrogen that dominates the atmospheric composition.

C (55%) YOUR ANSWER

This figure is inaccurate and suggests an exaggerated presence of nitrogen in the atmosphere. A concentration of 55% would imply nitrogen is almost the only gas present, which contradicts the established composition of Earth's atmosphere. The actual nitrogen concentration is well below this figure.

D (78%) CORRECT

This is the correct choice as it reflects the accurate proportion of nitrogen in the atmosphere. Nitrogen's predominance at 78% supports its role as a key component in the air we inhale and its importance in various environmental processes.

Conclusion

Earth's atmosphere is primarily composed of nitrogen, which constitutes about 78% of its volume. This fact is essential for understanding atmospheric composition and the various roles that nitrogen plays in biological and ecological systems. The other options presented are incorrect and fail to represent the actual distribution of gases in the atmosphere.

Which percentage of Earth's atmosphere is nitrogen (N₂)?

78% of Earth's atmosphere is nitrogen (N₂).

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