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Ozone is a form of oxygen found naturally in the Earth's atmosphere.
Ozone is violently reactive with most chemical compounds, including some which are normally considered inert. It is formed usually by electromagnetic action on oxygen. Ozone forms a layer, starting from a height of eight kilometres above the poles and 17 kilometres above the equator, and ending at an altitude of around 50 kilometres above the Earth's surface. UV causes sunburn, skin cancer and eye disease. Exposure to UV also reduces immunity to disease, and causes damage to crops and ocean life.