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There is evidence that large portions of the ozone layer have disappeared a few times in the past, even back before Mankind or the Industrial Revolution. So there is no way to know when was "first".
Thankfully, the Sun rapidly restores some ozone gradually.
The ozone layer has always become thinner during each poles winter months due to a lack of sunlight. No thinning occurs over populated areas. This is reserves to only areas that have long periods of darkness, like out poles during their winters.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoChemicals like chlorine in chlorofluorocarbons (CFCs) and other halons released by aerosols and refrigeration during the 20th Century destroyed ozone in the ozone layer.
An international treaty, the Montreal Protocol, phased out the use of these gases, though they can remain in the atmosphere for up to 70 years. Scientists hope that the ozone layer will have repaired itself by 2060.
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What weakens the ozone layer?
The weakening of ozone layer is due to its thinning. The ozone is thinning because of the attack of ozone depleting substances on it.
How can you prevent the thinning of ozone layer?
We can prevent the thinning of ozone layer by curbing the use of ozone depleting substances. These ODS contain compounds which react with ozone in the ozone layer and deplete it.
Sources of thinning of ozone layer?
CFC's cause thinning of ozone. They react with ozone to deplete it.
How do you overcome the thinning of ozone layer?
To overcome the thinning of ozone layer, we have to:Plant more treesStop using CFC's.
Which continent would be most impact by the thinning of ozone layer?
Antarctica is most affected by the thinning of the ozone layer.
What is ozone thinning occurring?
The thinning of ozone layer is the depletion of certain amount of molecules of ozone in the ozone layer. This is a harmful phenomenon.
What weakens the ozone layer?
The weakening of ozone layer is due to its thinning. The ozone is thinning because of the attack of ozone depleting substances on it.
Where is thinning of the ozone layer taking place?
In the ozone layer. Where the ozone is.
How can you prevent the thinning of ozone layer?
We can prevent the thinning of ozone layer by curbing the use of ozone depleting substances. These ODS contain compounds which react with ozone in the ozone layer and deplete it.
What is the reason for the thinning of the ozone layer?
The thinning of ozone layer is mainly due to man made ozone depleting substances. They react with ozone and decompose it.
Sources of thinning of ozone layer?
CFC's cause thinning of ozone. They react with ozone to deplete it.
Which is the reason for the thinning of the ozone layer?
CFC's are responsible for thinning of ozone. They react with ozone to thin it.
How do you slow down thinning of ozone layer?
Thinning of ozone layer can be minimized. It can be done by curbing the use of CFC's.
How do you overcome the thinning of ozone layer?
To overcome the thinning of ozone layer, we have to:Plant more treesStop using CFC's.
Which continent would be most impact by the thinning of ozone layer?
Antarctica is most affected by the thinning of the ozone layer.
What is the changes of ozone deplection?
The changes in ozone layer is the ozone hole. It is the thinning of ozone layer.
What do you call damage to the ozone layer?
damage to ozone layer is called ozone depletion. It is thinning of ozone layer.
