The ozone layer, also called the stratosphere, is composed of the ozone gas (90% of the total ozone in the atmosphere). The ozone has three oxygen atoms, and it is the result of the action of Ultra Violet (UV) radiation on oxygen molecules, composed of two oxygen atoms. read more
The ozone layer is thin -- only about the thickness of two stacked pennies -- and certain gases interact with ozone to cause a seasonal thinning of the layer. Most of the gases responsible for these ozone holes are released as a result of human industrial or agricultural activity. read more