Which of the following constitutes the lowermost layer of

Q: Answer-Which of the following constitutes the lowermost layer of the Earth's atmosphere?

The troposphere represents the lowest layer of the atmosphere and contains the densest air. It comprises approximately three-quarters of the entire atmospheric mass. The composition of air in this layer is 78 nitrogen and 21 oxygen, with the remaining 1 consisting of argon, water vapor, and carbon dioxide. This layer is where most weather phenomena occur.