Multiple choice

What causes greenhouse effect?

  1. Trapping of CO2 and water vapour by the ozone layer

  2. Trapping of sun rays by the atmosphere

  3. Increase in percentage of CO2 and methane

  4. Trapping of sun rays by the ozone layer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trapping of sun rays by the atmosphere causes greenhouse effect. A greenhouse gas is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. 

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