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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What type of layer forms the upper part of Earth’s atmosphere?

Ionosphere
Stratosphere
Thermosphere
Troposphere

The correct answer is: Stratosphere

The stratosphere is the layer of Earth's atmosphere above the troposphere and below the mesosphere. It is primarily composed of ozone which absorbs harmful ultraviolet radiation from the sun. The other options, ionosphere, thermosphere, and troposphere, are all layers within the stratosphere. The ionosphere is a layer within the thermosphere, the thermosphere is a layer within the mesosphere, and the troposphere is the bottom layer of the atmosphere. Therefore, they are not the correct answer for the type of layer that forms the upper part of Earth's atmosphere.