Atmosphere

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Atmosphere is an envelope of air that surrounds the Earth from all sides. It is essential for life because: 1) It contains oxygen and nitrogen gases that keep living organisms alive, 2) It protects Ea…

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99% of air is contained within the first 32 km of atmosphere from Earth's surface. This shows that the atmosphere is dense near the surface and becomes thinner at higher altitudes.

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Major atmospheric gases: 1) Nitrogen (N₂) - 78.00%, 2) Oxygen (O₂) - 21.00%, 3) Argon (Ar) - 0.93%, 4) Carbon dioxide (CO₂) - 0.03%, 5) Light gases (Neon, Helium, Ozone, Hydrogen, Methane, Krypton, Xe…

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Carbon dioxide is the heaviest gas in atmosphere, hence it is found in higher concentration up to 20 km from Earth's surface. Despite being only 0.03% of atmosphere, it plays a crucial role in photosy…

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Water exists in atmosphere in three forms: 1) Solid (snow particles), 2) Liquid (water droplets), 3) Gas (water vapour - most important). Water vapour comes from evaporation and transpiration, exists …

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Troposphere is the first layer of atmosphere surrounding Earth's surface. Characteristics: 1) Height varies - 16 km over tropics, 12 km over temperate regions, 8 km over polar regions, 2) Contains 75%…

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Tropopause is the upper surface of troposphere where temperature fall ceases and becomes steady. It is beneficial for aircraft flights because: 1) Air temperature remains stable, 2) Air movements calm…

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Stratosphere extends from end of troposphere to 50 km height. Called Stratosphere because temperature remains stable. Features: 1) No seasons, clouds, rain, or storms, 2) Clean, thin air allows fast j…