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Atmoshpere

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QuestionAnswer
What gases make up most of Earth’s atmosphere? Nitrogen (78%), Oxygen (21%), and trace gases including Carbon Dioxide and Water Vapor.
What is the first layer of the atmosphere and what happens there? Troposphere – closest to Earth; where weather occurs; temperature decreases with altitude.
What is the second layer of the atmosphere and what is found there? Stratosphere – contains the ozone layer that protects us from UV radiation; temperature increases with altitude.
What happens in the Mesosphere? Meteors burn up; temperature decreases with altitude.
What happens in the Thermosphere? : Auroras (Northern and Southern Lights) occur; temperatures can reach up to 2,500°C.
: Where is air density greatest and lowest? Greatest at the bottom (Troposphere) and lowest at the top (Thermosphere).
What was early Earth’s atmosphere like? It was rich in Carbon Dioxide and lacked Oxygen.
What released gases and water vapor into early Earth’s atmosphere? Asteroids, meteors, and volcanic activity.
What reduced water vapor in the air? Formation of oceans.
What introduced Oxygen and decreased CO₂ levels? Evolution of photosynthetic life.
What increased CO₂ again during the Industrial Revolution? Human use of fossil fuels.
What caused early Earth’s CO₂-rich atmosphere? Volcanic eruptions.
What are sources of atmospheric carbon? Respiration, Decomposition, Deforestation, Burning Fossil Fuels.
What are sinks of atmospheric carbon? Photosynthesis, Dissolving in Oceans, Formation of Fossil Fuels, Consumption of Food.
What has happened to CO₂ levels in the last 100 years? They have drastically increased due to human activities, especially burning fossil fuels.
How are CO₂ levels and global temperature related? As CO₂ levels rise, global temperature also increases — they are directly related.
What is the greenhouse effect? A natural process that traps heat in Earth’s atmosphere, keeping the planet warm enough for life.
What are the major greenhouse gases? : Carbon Dioxide, Methane, and Water Vapor.
What happens if there is too much greenhouse gas? It causes global warming.
What planet experiences a runaway greenhouse effect? : Venus, due to extremely high CO₂ levels.
How does human activity affect the greenhouse effect on Earth? It increases greenhouse gas levels and strengthens the greenhouse effect.
What separates the layers of the atmosphere? Temperature changes.
Where does weather occur? In the Troposphere.
Where is the ozone layer located? In the Stratosphere.
Where does the Aurora Borealis occur and why? In the Thermosphere, due to solar radiation interacting with atmospheric gases.
How was the early atmosphere formed? Mainly from volcanic gases and later changed by photosynthesis.
Why is understanding CO₂ trends important? It helps explain climate change.
Created by: user-2001027
 



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