Carbon Dioxide, Water Vapour and Methane are known as which type of gases?

• A. Greenhouse Gases
• B. Noble Gases
• C. Inert Gases
• D. Atmospheric Gases

Answer: (A)

The main idea is that these gases trap heat in the atmosphere by absorbing infrared radiation. When the Earth's surface warms it radiates heat as infrared light, and certain gases in the air absorb some of that infrared energy. They then re-emit heat in all directions, including back toward the surface, which keeps the lower atmosphere warmer. Carbon dioxide, water vapour and methane are effective at this because their molecules have vibrations that strongly absorb infrared wavelengths emitted by the Earth. Water vapour is a major natural greenhouse gas and also contributes to feedback: as temperatures rise, more water vapour can be present, amplifying warming. Noble or inert gases don’t absorb infrared energy well, so they don’t contribute much to the greenhouse effect, and the label “atmospheric gases” is too broad—these three are specifically known for their heat-trapping roles.