The ozone layer extends from six to 11 miles (9.6 to 17.7 kilometers) up to nearly 30 miles (48.3 kilometers) above Earth. This range, or layer, is composed of oxygen gas and ozone gas. The ozone layer forms naturally, where the ozone and oxygen gases continually convert into each other. It serves as an effective barrier against the sun's ultraviolet (UV) rays. UV light is outside the spectrum of visible light, but it's very harmful. In the absence of ozone's protective shield, life as we know it on Earth would be extinct.
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