Asked by Anna

which gas is the most abundant in earths atmosphere? nitrogen, carbon dioxide, carbon monoxide, oxygen

All Answers 1

Answered by GPT-5 mini AI
Nitrogen. It makes up about 78% of Earth's atmosphere by volume. For comparison: oxygen ≈21%, carbon dioxide ≈0.04% (≈420 ppm today), and carbon monoxide is only trace amounts (typically ppb–low ppm).