Atmosphere — Flashcards
Gujarat Board · Class 11 · Geography
24 flashcards for Atmosphere (Gujarat Board Class 11 Geography) to test yourself on key terms and facts. Sample: "What is atmosphere and why is it.
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What is atmosphere and why is it essential for life on Earth?
Answer
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…
What percentage of air is contained within the first 32 km of atmosphere from Earth's surface?
Answer
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.
List the major gases in atmosphere with their percentages.
Answer
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…
Why is carbon dioxide called the heaviest gas and what is its distribution in atmosphere?
Answer
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…
What are the different forms of water in atmosphere and their importance?
Answer
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 …
What is Troposphere and what are its main characteristics?
Answer
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%…
What is Tropopause and why is it beneficial for aircraft flights?
Answer
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…
Describe the Stratosphere and explain why it's called the Ozonosphere.
Answer
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…
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