The ozone layer surrounding the earth is formed when molecules of oxygen in that layer are converted to ozone by UV radiation.

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The ozone layer is formed when ultraviolet (UV) radiation from the sun splits oxygen molecules (O2) into individual oxygen atoms, which then combine with unbroken O2 molecules to form ozone (O3). This process occurs in the stratosphere, creating the ozone layer that protects life on Earth by absorbing the majority of the sun's harmful UV radiation.

The Ozone Layer Surrounding the Earth Is Formed When Molecules