which gas is most abundant in earths atmosphere?○ oxygen○ nitrogen○ water vapor○ carbon dioxide
which gas is most abundant in earths atmosphere?○ oxygen○ nitrogen○ water vapor○ carbon dioxide
Answer
Answer:
B. nitrogen
Brief Explanations:
Earth's atmosphere is approximately 78% nitrogen, making it the most abundant gas. Oxygen is the second most abundant at ~21%, while water vapor and carbon dioxide make up much smaller fractions (water vapor varies but is typically <4%, carbon dioxide is ~0.04%).