Major Components:
* Nitrogen (N₂): 78.084% - The most abundant gas, it's relatively inert and plays a crucial role in biological processes.
* Oxygen (O₂): 20.946% - Essential for respiration and combustion.
* Argon (Ar): 0.934% - A noble gas, it's generally unreactive.
Trace Gases:
* Carbon Dioxide (CO₂): 0.0415% - A greenhouse gas, its levels are increasing due to human activities.
* Neon (Ne): 0.001818%
* Helium (He): 0.000524%
* Methane (CH₄): 0.00017% - A potent greenhouse gas.
* Krypton (Kr): 0.000114%
* Hydrogen (H₂): 0.00005%
* Nitrous Oxide (N₂O): 0.00003% - A greenhouse gas and ozone-depleting substance.
* Xenon (Xe): 0.0000087%
* Ozone (O₃): Variable, but generally around 0.000004% - Found in the stratosphere, where it absorbs harmful ultraviolet radiation.
Other Gases:
* Water Vapor (H₂O): Highly variable (0-4%) - Plays a crucial role in weather and climate.
* Aerosols: Tiny particles suspended in the air (dust, soot, sea salt, etc.) - They influence cloud formation and air quality.
Important Notes:
* Variable Composition: The composition of the atmosphere can vary depending on location, altitude, and time.
* Greenhouse Gases: Gases like carbon dioxide, methane, and nitrous oxide trap heat in the atmosphere, contributing to global warming.
* Human Impact: Human activities have significantly altered the composition of the atmosphere, particularly by increasing greenhouse gas concentrations.
Let me know if you want more details about any of these gases!
