Explain how is ozone formed? State the significance of ozone layer.

Explanation

Ozone layer is located at the higher levels of the atmosphere, Le., in stratosphere.
`rarr` Ozone is formed by the action of DV (Ultra- violet) radiation on oxygen `(O_2)` molecule.
`rarr` The higher energy of DV radiation convert some oxygen `(O_2)` molecules into free oxygen (O) atoms.
`rarr` These free oyxgen atoms combine with the molecular oxygen and form a molecule of ozone `(O_3)`.
`O_(2) overset(UV)underset("(Phtodisssocation)")O+O`
`O+O_2 rarr O_3`(Ozone)
Significance: Ozone shields the surface of the earth from ultraviolet (DV) radiation from the sun. The ozone molecules absorb short wave-length DV rays which are harmful to organisms. Thus, it protects life on the earth.