Question

what is ozone? what is the ozone layer? how is the presence of ozone layer essential to preserve life on earth

Answer 1

Here is your answer...
A colourless unstable toxic gas with a pungent odour and powerful oxidizing properties, formed from oxygen by electrical discharges or ultraviolet light. It differs from normal oxygen (O2) in having three atoms in its molecule (O3).

A layer in the earth's stratosphere at an altitude of about 10 km (6.2 miles) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.

The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects. When the sky is clear, there is an inverse relationship between stratospheric ozone and solar UVR measured at the Earth's surface.

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Answer 2

The majority of the UV light from the Sun is absorbed by the Earth's stratosphere's ozone layer, also known as the ozone shield.

• In comparison to other areas of the atmosphere, it has a high concentration of ozone (O3), yet it is still relatively low in comparison to other gases in the stratosphere.
• The average ozone concentration in the Earth's atmosphere is about 0.3 parts per million, whereas the ozone layer has a concentration of fewer than 10 parts per million. Although its thickness varies seasonally and geographically, the ozone layer is primarily located in the lower stratosphere, from about 15 to 35 kilometres (9 to 22 mi) above Earth.
• Charles Fabry and Henri Buisson, two French physicists, made the discovery of the ozone layer in 1913.
• Life on Earth is protected by the ozone layer.
• A form of radiation known as ultraviolet radiation, or UV light, which can penetrate organisms' protective layers like the epidermis and harm DNA molecules in plants and animals, is well-trapped by ozone. UVB and UVA are the two main subtypes of UV light.

Hence, Ozone layer is very important.

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