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ozone

phys. A gas of oxygen molecules composed of three, rather than usual two, oxygen atoms. O3 is formed when the molecule of stable oxygen (O2) is split by UV radiation […]

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Ozone hole

biol.

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ozone layer

biol. A region of the atmosphere lying mostly in the stratosphere, between about 15 and 30 kilometers in altitude, containing a relatively high concentration of ozone that absorbs solar ultraviolet […]

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