Which of the following statements about the greenhouse effect is true?

• A. The greenhouse effect is caused by certain gases trapping heat in Earth's atmosphere.
• B. The greenhouse effect is caused by the depletion of the ozone layer.
• C. The greenhouse effect is responsible for cooling Earth's surface.
• D. The greenhouse effect only occurs during the night.

Answer: (A)

Verified step by step guidance

1. Understand the greenhouse effect: The greenhouse effect is a natural process where certain gases in Earth's atmosphere trap heat, keeping the planet warm enough to support life. These gases include carbon dioxide (CO₂), methane (CH₄), water vapor (H₂O), and others.
2. Eliminate incorrect options: Review each statement critically. For example, the greenhouse effect is not caused by the depletion of the ozone layer, as the ozone layer primarily protects Earth from harmful ultraviolet radiation.
3. Analyze the cooling claim: The greenhouse effect is responsible for warming Earth's surface, not cooling it. This eliminates the option stating it cools Earth's surface.
4. Consider the timing: The greenhouse effect occurs continuously, both during the day and night, as greenhouse gases trap heat regardless of the time of day. This eliminates the option stating it only occurs at night.
5. Identify the correct statement: The correct statement is that the greenhouse effect is caused by certain gases trapping heat in Earth's atmosphere. This aligns with the scientific understanding of the greenhouse effect.