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The ozone hole is a repeating phenomenon, that has most likely occurred since there was ozone in the atmosphere (hundreds of millions of years). The size of the hole is the issue, whether Man plays any part in making it bigger.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoEver since the earth was made!!!!!!!!!!!!!!
Not a good answer. Ozone production is based on the presence of free oxygen in the atmosphere and the very early Earth didn't have any.
Wiki User
∙ 12y agoThe ozone hole only presents itself in the spring.
Remember that spring occurs in September in Antarctica
Wiki User
∙ 8y agoOzone layer was created long before humans. It was formed when the atmosphere was born.
Wiki User
∙ 7y agoIts been there since earth was created.
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How long ago was the ozone layer found?
few days ago
What era was the ozone layer developed?
In the Precambrian time, 4.6 billion yrs. ago
When did ozone layer develop?
See "It is true that life could not have existed on land until the ozone layer formed about 2 million years ago Why does life on land require an ozone layer?" in the "Related questions" section below.
Are chlorofluorocarbons toxic and flammable?
CFC's (chlorofluorocarbons) are refrigerants ("Freons"). It was discovered some years ago that their eventual leakage into the atmosphere was causing a destruction of a natural layer of ozone in the earths upper atmosphere, which acts as an important barrier to excessive UV radiation. CFC's were banned about 20-25 years ago, and replaced with other, non-harmful fluorocarbons. It has had an effect - a recent report in Time magazine stated that the "hole" in the ozone layer is almost repaired due to the elimination of CFC's.
Was ozone present in the early atmosphere?
2.3 billion years ago marks the Great Oxidation Event (before life is expected to have climbed onto land). At this time, there would have been an ozone layer. yes, the ozone is needed for life
How long ago was the ozone layer found?
few days ago
What era was the ozone layer developed?
In the Precambrian time, 4.6 billion yrs. ago
What phase of evolution was the ozone created?
Ozone was created long ago. It was due to this fact humans were able to develop.
Where was the ozone layer invented?
In the atmosphere. Hundreds of millions of years ago.
When did ozone layer develop?
See "It is true that life could not have existed on land until the ozone layer formed about 2 million years ago Why does life on land require an ozone layer?" in the "Related questions" section below.
It is thought that life could not have existed on land until the ozone layer formed about 2 billion years ago. Why does life on land require an ozone layer?
Because the ozone layer provides a thin layer of protection from the harmful UV rays or ultraviolet rays.
In what year do scientists believe that the hole in the Ozone Layer over Antarctica first appeared?
Right after the Great Oxidation Event, when the ozone layer first formed. About 500 million years ago.
Is it through that life could not have existed on land until the ozone later formed about 2 billion years ago why does life on land require an ozone layer?
Life on earth requires an ozone layer. It is because it absorbs the fatal UV rays of the sun.
How does radiation get to us from the sun?
The sun naturally gives off radiation through ultraviolet rays but the ozone layer around earth blocks most of the harmful radiation, a few years ago people using spray-cans with CFC's in them (chlorofluorocarbons) created a hole in the ozone layer over the arctic CFC's were banned but they did their damage.
What make scientist think that the ozone layer is disappearing?
Scientists believe that the ozone layer is disappearing because there is a large hole in it. This hole was not there years ago.
When was Candles Long Ago created?
Candles Long Ago was created in 1994.
When was A Long Time Ago created?
A Long Time Ago was created in 1991.
