<human>: Why is the ozone layer depleting?
<bot>: The ozone layer is a protective layer in the stratosphere that absorbs UV radiation from the sun. It is made up of oxygen and nitrogen molecules, which are constantly being destroyed by solar radiation. When these molecules are destroyed, they release free radicals, which can react with other molecules to form ozone. Ozone is a powerful oxidant, so it helps protect us from the harmful effects of UV radiation.