Natural Science CLEP Prep Practice Exam

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Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

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When is the most sun radiation in the Earth's atmosphere?

  1. During the day

  2. During the night

  3. Before the sun rises

  4. After the sun sets

The correct answer is: During the day

The most sun radiation in the Earth's atmosphere occurs during the day because that is when the sun is visible and most actively emitting radiation. During the night, the sun is not visible and therefore not emitting as much radiation. Before the sun rises and after the sun sets, there is less direct exposure to the sun's rays, so the amount of radiation in the atmosphere is also lower compared to daytime. Therefore, A is the most accurate answer.

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