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"OZONE" icon

OZONE

Ozone (OH zohn) is a gas that is present in small amounts in Earth's atmosphere. In the troposphere (the lowest level of the atmosphere), ozone is a pollutant. It can harm plant and animal tissues, and it can damage rubber and plastic. Ozone in the stratosphere (the layer above the troposphere) blocks harmful ultraviolet rays from the sun, protecting life on Earth. Every spring in the Southern Hemisphere since the late 1970's, scientists have...

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