Chlorofluoro-carbons are very stable and when they reach ..... kilomtres altitude (where the concentration of ozone is supposed to be highest),they are subjected to intense ultraviolet radiation from the sun.

ENVIRONMENTAL SCIENCES

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Chlorofluoro-carbons are very stable and when they reach ____ kilomtres altitude (where the concentration of ozone is supposed to be highest),they are subjected to intense ultraviolet radiation from the sun.

A	25
B	28
C	30
D	32

Explanation:

Detailed explanation-1: -Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth’s surface (see the figure below).

Detailed explanation-2: -Most ozone (about 90%) is found in the stratosphere, which begins at about 10–16 kilometres above Earth’s surface, depending on latitude, and extends to an altitude of about 50 kilometres.

Detailed explanation-3: -Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules.

Detailed explanation-4: -The ozone layer is the common term for the high concentration of ozone that is found in the stratosphere around 15–30km above the earth’s surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun.

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