Question

A layer of ...................... present about 25 km from earth's surface absorbs a great deal of incoming ...................... rays other sunlight.

Answer 1

In the region of upper stratosphere, about 25 km from earth's surface, a layer called ozone is present which absorbs about 99% of the incoming harmful Ultraviolet (UV) rays from the sunlight and prevent them from reaching the surface of earth. Ozone is being formed and photodissociated in stratosphere. Ozone layer can get depleted by some man made chemicals known as ozone depleting compounds like CFCs (chlorofluorocarbon).

So, the correct answer is 'ozone, ultraviolet'.