The highest concentration of the ozone layer is found approximately 20 kilometers above the Earth’s surface. While ozone exists throughout the stratosphere (extending up to 50 km), its peak density—where it most effectively filters out the sun’s harmful ultraviolet rays—occurs in the lower stratosphere between 15 km and 30 km. ANSWER: (B) 20 km
Approximately how high above the Earth is the ozone layer? (A) 2000 km (B) 20 km (C) 50 km (D) 300 km
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The ozone layer isn’t a solid “sheet,” but a region of gas within the stratosphere. While the stratosphere itself goes up to 50 km, the majority of ozone molecules are clustered much lower, averaging about 20 km in altitude. At this height, the balance of oxygen and solar radiation is perfect for the “Ozone-Oxygen Cycle.” If the ozone were at sea level, it would be a toxic pollutant (smog), but at 20 km high, it is a vital shield that absorbs over 97% of high-frequency ultraviolet light, making it the most important biological filter in the atmosphere.
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