Environmental Protection Agency (EPA) MVAC Certification

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Get ready for the EPA MVAC Certification exam with our study materials covering flashcards and multiple choice questions, each offering hints and explanations. Prepare thoroughly for your certification!

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At what altitude does the ozone layer extend around the Earth?

0 to 7 miles
7 to 30 miles
10 to 25 miles
30 to 50 miles

The correct answer is: 7 to 30 miles

The ozone layer, which plays a crucial role in protecting life on Earth by absorbing most of the sun's harmful ultraviolet (UV) radiation, is primarily located in the stratosphere. This region of the atmosphere extends roughly from 7 to 30 miles above sea level. The designated range of 7 to 30 miles is significant because this is where the concentration of ozone (O₃) increases, forming a protective layer. This layer is essential for filtering out UV rays that can cause skin cancer and other harmful effects. The structure of the atmosphere is layered, with the stratosphere being located above the troposphere and directly below the mesosphere. Understanding the altitude of the ozone layer is important not just for general knowledge, but also for assessments related to environmental science, public health, and regulations regarding substances that can deplete the ozone, such as chlorofluorocarbons (CFCs).