What are the main components of pure, dry air by percentage?

The main components of pure, dry air are accurately represented by the choice stating that it consists of 78% nitrogen, 21% oxygen, and 1% other gases. This composition reflects the typical atmospheric conditions found at sea level. Nitrogen is the most abundant gas in the Earth's atmosphere, accounting for nearly four-fifths of the air we breathe. Oxygen follows as the second most prevalent gas and is essential for supporting life. The remaining 1% encompasses a variety of other trace gases, including argon, carbon dioxide, neon, and others, which are present in much smaller quantities but still play significant roles in various atmospheric processes.

Understanding this composition is crucial for numerous fields, including meteorology and environmental science, as it influences not only weather patterns but also the overall health of ecosystems and the planet's climate.