Atmospheric Structure and Ozone

The outer solid layer of the earth, called the lithosphere, is made of rock. The lithosphere is the solid outermost shell of a rocky planet. On the Earth, the lithosphere includes the crust and the uppermost layer of the mantle.

The ozone layer filters harmful UV radiation. Its depletion allows more UV-B and UV-C rays to reach Earth's surface, increasing skin cancer risk and ecosystem damage.

The Antarctic ozone hole was discovered in the 1980s and is most severe during Antarctic spring (September-October). Cold conditions and CFC accumulation create this seasonal phenomenon.

The greenhouse effect traps heat in Earth's atmosphere, maintaining average temperatures around 15°C instead of -18°C. Without it, Earth would be too cold for life as we know it.

The ozone layer absorbs harmful ultraviolet (UV) radiation from the sun, protecting living organisms from DNA damage and skin cancer. It does not filter general air pollution or moderate solar heat - its primary function is blocking UV rays.

Earth's atmosphere contains approximately 21% oxygen, which is essential for most life forms and combustion. The remaining 78% is mostly nitrogen, with trace gases making up the final 1%. This 21% figure is a fundamental fact in atmospheric science.

Chlorofluorocarbons (CFCs) are synthetic compounds that break down in the stratosphere, releasing chlorine atoms that catalytically destroy ozone molecules. This led to the formation of the ozone hole. Oxides, sulphides, and hydroxides do not have this ozone-depleting effect.

CFCs release chlorine atoms when exposed to UV radiation in the stratosphere. These chlorine atoms react with ozone (O3), breaking it down into O2. One chlorine atom can destroy thousands of ozone molecules through a chain reaction.

Ozone is indeed a poisonous/toxic gas that can cause respiratory damage. It is triatomic (O3), not mono-atomic. It is found in the stratosphere (upper atmosphere), not the lower atmosphere, and it absorbs UV radiation rather than reflecting it.

The ozone layer primarily absorbs ultraviolet (UV) radiation from the sun. This absorption protects living organisms from harmful UV rays that can cause skin damage and cancer.

The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity.

The exosphere is located too far above Earth for any meteorological phenomena to be possible. The exosphere contains most of the satellites orbiting Earth.

The stratosphere is almost completely free of clouds and other forms of weather. However, polar stratospheric or nacreous clouds are occasionally seen in the lower part of this layer of the atmosphere where the air is coldest. This is the highest layer that can be accessed by jet-powered aircraft.

D is linked with 1 with the word ‘ecosystem’ and introduction of air. B explains the statement given in D. ‘The remaining gases’ in C refers to ‘gases’ in B. ‘Filtered air includes’ in E and ‘Air also contains’ in 6 connect them.