2.1.1 Atmospheric Composition

• Nitrogen (N₂) makes up approximately 78% of the Earth's atmosphere.
• Carbon dioxide (CO₂) and methane (CH₄) are examples of greenhouse gases that trap heat in the atmosphere.
• Arrange the main components of the atmosphere in order from most abundant to least abundant:

  1️⃣ Nitrogen (N₂)

  2️⃣ Oxygen (O₂)

  3️⃣ Argon (Ar)
• What does ozone (O₃) in the atmosphere protect the Earth from?

  Ultraviolet radiation
• What is the primary role of oxygen (O₂) in the atmosphere?

  Supports respiration and combustion
• Ozone (O₃) is a potent greenhouse gas.

  False
• What is the approximate percentage of argon (Ar) in the atmosphere?

  0.93%
• Match each gas with its role in the atmosphere:

  Nitrogen (N₂) ↔️ Dilutes oxygen, aids plant growth

  Oxygen (O₂) ↔️ Supports respiration and combustion

  Argon (Ar) ↔️ Inert gas used in industry

  Ozone (O₃) ↔️ Absorbs UV radiation
• Nitrogen, the most abundant gas, dilutes oxygen
• What is the role of carbon dioxide in the atmosphere?

  Traps heat
• Match the gas with its role in maintaining atmospheric balance:

  1️⃣ Nitrogen

  2️⃣ Dilutes oxygen and aids plant growth

  3️⃣ Oxygen

  4️⃣ Supports respiration and combustion

  5️⃣ Argon

  6️⃣ Used in industrial applications
• Changes in atmospheric composition can disrupt the delicate balance and affect climate patterns.


  True
• What is the percentage of nitrogen in the atmosphere?

  78%
• What are three examples of trace gases in the atmosphere?

  CO₂, CH₄, O₃
• Match the gas with its role in regulating climate and environment:

  Carbon dioxide ↔️ Traps heat in the atmosphere

  Methane ↔️ Contributes to global warming

  Ozone ↔️ Absorbs harmful UV radiation
• Oxygen is essential for aerobic respiration and combustion
• Carbon dioxide is a greenhouse gas that traps heat
• What does ozone in the upper atmosphere protect life on Earth from?

  Ultraviolet radiation
• Oxygen is crucial for maintaining a habitable environment on Earth.


  True
• Carbon dioxide is a vital input for plant photosynthesis
• What happens when greenhouse gas levels increase in the atmosphere?

  Global warming
• Nitrogen makes up 78% of the atmosphere.
• Argon is the third most abundant gas in the atmosphere.


  True
• Methane is a potent greenhouse gas that contributes to global warming
• What can happen if greenhouse gas levels increase significantly in the atmosphere?

  Global warming
• What does atmospheric composition refer to?

  Proportions of gases and matter
• What percentage of the atmosphere is composed of oxygen (O₂)?

  21%
• Argon (Ar) makes up less than 1% of the Earth's atmosphere.


  True
• Which trace gas absorbs ultraviolet radiation in the atmosphere?

  Ozone (O₃)
• What is the primary role of carbon dioxide (CO₂) in the atmosphere?

  Greenhouse gas
• Trace gases like carbon dioxide (CO₂) and methane (CH₄) play crucial roles in regulating climate and environmental conditions.
• Why is argon (Ar) used in industrial processes such as lighting and welding?

  Inertness
• What is the approximate percentage of nitrogen (N₂) in the atmosphere?

  78%
• Oxygen (O₂) makes up approximately 21% of the Earth's atmosphere.
• What type of gas is argon?

  Inert gas
• Oxygen is essential for aerobic respiration and combustion processes.


  True
• Methane is a potent greenhouse gas that contributes to global warming
• What does ozone in the upper atmosphere absorb?

  Ultraviolet radiation
• Atmospheric composition refers to the proportions of various gases and particulate matter
• Oxygen makes up 21% of the atmosphere.


  True