Major Gases:
* Nitrogen (N2): About 78% of the atmosphere. It's relatively inert and plays a vital role in plant growth.
* Oxygen (O2): Around 21%. Essential for respiration of most living organisms.
* Argon (Ar): Makes up about 0.93%. It's a noble gas, meaning it's chemically unreactive.
Trace Gases:
* Carbon dioxide (CO2): A significant greenhouse gas, currently at about 0.04%. Its concentration is increasing due to human activities.
* Neon (Ne), Helium (He), Krypton (Kr), Xenon (Xe): These are noble gases found in trace amounts.
* Ozone (O3): Found in the stratosphere, it absorbs harmful ultraviolet radiation from the sun.
* Water vapor (H2O): The amount varies significantly depending on location and weather conditions. It's a major greenhouse gas and crucial for weather patterns.
* Methane (CH4): A potent greenhouse gas, its concentration is increasing due to human activities.
* Nitrous oxide (N2O): Another powerful greenhouse gas.
* Other gases: In extremely small quantities, various other gases are present, including hydrogen, sulfur dioxide, carbon monoxide, and ammonia.
Variable Components:
* Aerosols: Tiny particles like dust, smoke, sea salt, and volcanic ash can be found in the atmosphere. They can influence climate and affect air quality.
The composition of the atmosphere can vary depending on altitude, location, and time of day.
