# What protects us from harmful radiation of the sun?

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Oct 21, 2016

The OZONE LAYER which lies in Stratosphere (16 to 48 kilometers above earth's surface) protects us from harmful UV radiation.

#### Explanation:

Ozone layer help us by trapping harmful radiation from the sun. Ultraviolet(UV) rays are harmful rays which come from the sun.

Ozone layer is made up of ${O}_{3}$ or three atoms of oxygen. When UV rays of 230 to 320 $\mu m$ hit the ozone layer, ${O}_{3}$ absorbs its energy and gets converted into ${O}_{2}$ & then $O$. ${O}_{2}$ molecule combine with this $O$ molecule and form ${O}_{3}$ by this ozone is formed again. This happens continuously in the whole layer.

The use of Chlorofluorocarbons (which is used in refrigerator) stops the ozone to form again & it damage the ozone layer

When UV rays strike chlorofluorocarbon($C F C {l}_{3}$) its carbon-chlorine bond breaks. This produces a Chlorine atom & this atom reacts with ${O}_{3}$ breaking it apart, which causes a hole in ozone layer.

Gamma ray and X-ray are also harmful radiation which comes from space. Just a single high-energy photon of gamma rays can cause significant damage to a living cell. But our earth's atmosphere protect us by absorbing it.

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Apr 22, 2016

The Ozone Layer protects us from harmful radiation from the Sun.

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• The meaning of "Ozone Layer"

The meaning of ozone layer or ozone shield refers to a region of Earth's stratosphere and tropopause that absorbs most of the Sun's ultraviolet (UV light) radiation. It contains high concentrations of ozone (${O}^{3}$ or 3 molecules of oxygen).

• How we are protected by Ozone Layer

Because of the thickness of the ozone layer, that is, the total amount of ozone in a column overhead varies by a large factor worldwide, being in general smaller near the equator and larger towards the poles.

It also depends with season, being in general thicker during the spring and thinner during the autumn. The reasons for this latitude and seasonal dependence are complicated, involving atmospheric circulation patterns as well as solar intensity.

Since ozone (${O}^{3}$) is produced by solar UV light radiation, one might expect to find the highest ozone levels over the tropics and the lowest over polar cities. The same argument would lead one to expect the highest ozone levels in the summer climates and the lowest in the winter climates.

The observed behavior is very different: most of the ozone is found in the mid-to-high latitudes of the northern and southern hemispheres, and the highest levels are found in the spring, not summer, and the lowest in the autumn, not winter in the northern hemisphere. During winter, the ozone layer actually increases in depth.

Our ozone layer became thinner in the continent Antarctica. The hole in that continent will be thicker as of the year 2030.

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