Tag: ozone layer depletion and causes
Questions Related to ozone layer depletion and causes
Ozone layer of upper atmosphere is being destroyed by
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Chlorofluorocarbons
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$ { SO } _{ 2 } $
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Smog
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None of the above
Ozone hole means
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Hole in the stratosphere
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Same concentration of ozone
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Decrease in the concentration of ozone
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Increase in the concentration of ozone
Ozone occurs in the concentration of up to 1 ppm in the stratosphere as compared to 0.5 ppm in the troposphere. Ozone is formed in the stratosphere from oxygen due to solar radiations. Maximum ozone concentration is found at a distance of 23 to 25 km above the equator and 11 to 16 km over poles. It is called as ozone layer or ozonosphere.
Formation of ozone hole is maximum over
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India
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Antarctica
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Europe
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Africa
The thickness of ozone over the poles changes with the seasons being lowest in polar spring and maximum in polar autumn. Ozone hole refers to the depletion in the concentration of ozone over a restricted area as spring time decline over Antarctica. Spring time depletion of ozone is due to the action of sunlight over pollutants, which release chemicals like chlorine, that destroy ozone.
Ozone hole means
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Hole in the stratosphere
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Same concentration of ozone
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Decrease in concentration of ozone
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Increase in the concentration of ozone
In atmosphere , Ozone hole refers to
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A hole in ozone layer
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Decrease in ozone layer thickness in troposphere
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Decrease in thickness of ozone layer in stratosphere
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Increase in the thickness of ozone layer in troposphere
The region of stratosphere, at an altitude of 16-50km over equator and at a slightly lower altitude elsewhere having a thick sheet of ozone is known as ozonosphere. Decline in the thickness of ozone layer over a restricted area is called ozone hole. It was first discovered over Antarctica in 1985 by Dr. Joe C. Farman and his colleagues in the British Antarctica surveys. Chlorofluorocarbons are mainly responsible for ozone depletion in the stratosphere. CFC's are used as coolants in refrigerators and air conditioners, as propellants, cleaning solvents. Once released into the atmosphere, CFC'S reach the stratosphere and produce active chlorine in the presence of UV radiations. These radicals through chain reaction destroy ozone by converting it into oxygen.
The pollutant that causes hole in the ozone layer is
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$SF _{6}$
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nitrousoxide
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$CFC _{s}$
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$PFC _{s}$
'Ozone-hole' means
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A large sized hole in the ozone layer
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Thinning of the ozone layer
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Small holes scattered in the ozone layer
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Thickening of ozone in the ozone layer
Ozone layer is a region of concentration of ozone molecule. $O _3 (O _2+
O)$ in the earth's atmosphere. The layer lies in the stratosphere at an
altitude of 18-50 kms. The ozone layer naturally Shields earth's life
from the harmful effect of the Sun's ultraviolet radiations. A severe
depletion of ozone (ozone hole) in a region of the ozone layer was found
particularly over Antarctica. The depletion is caused by
chlorofluorocarbons and by other compounds like $CCI _4, CF _4$ etc. So, the correct answer is 'Thinning of the ozone layer'.
In which part of atmosphere, ozone layer is present?
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Stratosphere
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Troposphere
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Mesosphere
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Thermosphere
The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres above Earth, which shields the earth from the sun's harmful ultraviolet radiations. Ozone gas is present in 10 ppm in this ozone layer.
Ozone hole was first detected over
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Antarctica
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Arctic circle
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Equator
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Polar region
Ozone hole means
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A large sized in the stratosphere layer
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Thinning of the ozone layer at the poles
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Small holes scattered in the ozone layer
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Thickening of the ozone layer at the poles
We know that surrounding the troposphere of earth, there is a layer of the stratosphere. It is made up of ozone molecules that are formed by the effect of UV rays in these areas. Due to excessive chlorofluorocarbon compounds, and emission of carbon dioxide, it is getting depleted. At the poles, it is constantly getting thinner and thinner. This is called the ozone hole.