Tag: the earth and its living world

Troposphere is the layer where all weather occurs. this is the lowest layer.

Troposphere is the lowest layer in the earth's atmosphere. it is the same layer in which all the change in weather takes place. Lapse rate is the rate at which the temperature drops due to the difference in elevation. the more the altitude the more the drop in temperature is there. The lapse rate of $6.5$ is there for the level of $0$ to  $11,000$ m. This is the region in which troposphere lies. 

The Ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains high concentrations of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. As the ozonosphere only contains high levels of ozone gas, therefore all the other things such as the dust particles. water vapours and CO2 are absent from it. 

Ozone is concentrated mainly in the stratosphere, where it absorbs solar radiation, protecting Earth's living organisms from the ultraviolet light from the sun. UV radiation is harmful to DNA; without the atmosphere's ozone, living organisms could not exist and thrive as they do now. The area in which ozone is concentrated in stratosphere is called the ozonosphere, So the correct answer is 'Both B and C'.

Most of the sun's UV-B radiation is absorbed by ozone in the stratosphere. UV-C radiation is absorbed by oxygen and ozone in the stratosphere and never reaches the Earth's surface. This is good because the C type rays are the most damaging of all. So the correct answer is 'Complete UV-C and a large amount of UV-B '