The term 'Endangered Layer' refers to the OZONE layer, which is a layer of gas in the Earth's atmosphere that protects us from the sun's ultraviolet radiation. OZONE, which has five letters, is a molecule composed of three oxygen atoms. It is found naturally in the stratosphere and is essential for life on Earth. Unfortunately, human activities such as the release of chlorofluorocarbons (CFCs) have caused the OZONE layer to become depleted, leading to an increase in UV radiation and other environmental problems.