Natural Science CLEP Prep 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

The operating principal of the greenhouse effect is

Sunlight reflects off of the Earth’s surface

Heat from the sun becomes trapped in the atmosphere

The operating principle of the greenhouse effect is that heat from the sun becomes trapped in the atmosphere. The other options are incorrect as they do not describe the mechanism of the greenhouse effect. Option A mentions sunlight reflecting off the Earth's surface, which does not contribute to the trapping of heat. Option C mentions the Earth's surface absorbing infrared radiation, but does not explain how this leads to the greenhouse effect. Option D mentions UV rays increasing the temperature of the atmosphere, but UV rays are not the main cause of the greenhouse effect. Therefore, while these options may have some relation to heat and the atmosphere, they are not the main operating principle of the greenhouse effect.

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The Earth’s surface absorbs infrared radiation

UV rays increase the temperature of the atmosphere

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