'''Ozone shield''' is a layer of the [[atmosphere]] composed of [[ozone]] [[gas]] (O3) that resides approximately 25 miles above the [[Earth]]'s surface and absorbs solar [[ultraviolet]] [[radiation]] that can be harmful to living organisms. | '''Ozone shield''' is a layer of the [[atmosphere]] composed of [[ozone]] [[gas]] (O3) that resides approximately 25 miles above the [[Earth]]'s surface and absorbs solar [[ultraviolet]] [[radiation]] that can be harmful to living organisms. |