1.3. What is in the air?

What is the percentage of water vapour in the air?

• 0.97%
• 0.03%
• 21%
• 78%

What is the main function of noble gases in the atmosphere?

• None
• Absorbing ultraviolet radiation
• Absorbing visible light
• Absorbing infrared radiation

What is the main function of clouds during the day?

• Absorb infrared radiation
• Absorb ultraviolet radiation
• Absorb visible light
• Absorb X-rays

What is the average temperature of the Earth without the greenhouse effect?

• -18 °C
• 15 °C
• 0 °C
• 30 °C

What is the main function of the troposphere?

• Containing most of the atmospheric gases
• Absorbing ultraviolet radiation
• Absorbing infrared radiation
• Absorbing visible light

What is the main function of the exosphere?

• Unknown
• Absorbing ultraviolet radiation
• Absorbing visible light
• Absorbing infrared radiation

What is the main function of water vapour in the troposphere?

• Absorbing ultraviolet radiation
• Absorbing infrared radiation
• Retaining heat emitted by the Earth's surface
• Absorbing visible light

What is the greenhouse effect?

• Retaining heat emitted by the Earth's surface
• Absorbing ultraviolet radiation
• Absorbing visible light
• Absorbing infrared radiation

Which layer of the atmosphere contains the most atmospheric gases?

• Stratosphere
• Troposphere
• Mesosphere
• Thermosphere

What is the main function of the atmosphere in protecting the Earth?

• Stopping meteors
• Absorbing ultraviolet radiation
• Absorbing visible light
• Absorbing infrared radiation