How does ozone layer prevent the incidence of harmful UV-radiation on the earth's surface?

How is ozone layer formed?

Which radiation coming from the sun, is prevented by the ozone layer from falling on the earth's surface?

Average intensity of the solar energy incident on the earth's surface is 1300 W.m^(-2) . Calculate the rms values of electric and magnetic fields due to this radiation near the earth's surface. (Given mu_0=4pixx10^(-7)H.m^(-1) )

Which among tlie following gases absorb long wavelength infrared radiation emitted from the earth’s surface-

Assertion (A) : Presently, the global atmosphere is warming up. Reason (R): The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the Earth.

How much below the surface of earth does acceleration due to gravity become 1% of its value at the earth's surface ? The earth is assumed to be a sphere of radius 6.4xx10^6m .

A man bailed out of a balloon. After some time the parachute opened up and he could land on the earth's surface with a retardation of 2.4 "m.s"^(-2) and took 4 times that elapsed before the parachute opened. If the balloon was at a height of 398.4 m, how long was he airborne ?

Most harmful for ozone layer depletion is -

Average distance of the sun from the earth is 1.5xx10^8 km and the average intensity of sunlight incident on the earth's surface is 1300 W . m^(-2) . Calculate the energy radiated per second from the surface of the sun.