Arrange the following constituents of the atmosphere in descending order (in terms of their quantity):

Key Points

• Nitrogen is the most abundant gas in the Earth's atmosphere, constituting approximately 78% of the atmosphere.
• Oxygen is the second most abundant gas, making up about 21% of the atmosphere.
• Argon is the third most abundant gas, comprising roughly 0.93% of the atmosphere.
• Carbon dioxide (CO₂) is a trace gas in the atmosphere, present at about 0.04%.

Additional Information

• Atmosphere Composition:
  • The atmosphere is composed of various gases, each contributing to different aspects of climatic and environmental conditions.
  • The primary constituents include Nitrogen, Oxygen, Argon, and Carbon Dioxide.
  • Other trace gases include Neon, Helium, Methane, Krypton, and Hydrogen.
• Nitrogen (N₂):
  • Nitrogen is crucial for life, forming essential compounds like amino acids, proteins, and nucleic acids.
  • It is inert under most conditions but is vital for the nitrogen cycle, involving processes like nitrogen fixation and denitrification.
• Oxygen (O₂):
  • Oxygen is essential for respiration in most living organisms and supports combustion.
  • It forms ozone (O₃) in the stratosphere, which protects living organisms from harmful ultraviolet radiation.
• Argon (Ar):
  • Argon is a noble gas used in various industrial processes, including welding and manufacturing.
  • It is chemically inert and does not react under normal conditions.
• Carbon Dioxide (CO₂):
  • Carbon dioxide is a greenhouse gas, playing a significant role in regulating Earth's temperature.
  • It is produced by respiration, combustion, and volcanic activity, and is absorbed by plants during photosynthesis.