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It was nonexistent before there was significant oxygen in the atmosphere.

After the Great Oxidation Event, we developed our ozone layer, complete with annual ozone "holes" at each pole.

We have evidence of sporadic events punching holes in the ozone layer from time-to-time.

Since the 1700s, the ozone layer has been getting steadily thinner.

This gets us to "current events".

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13y ago
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9y ago

The ozone layer is being depleted in last 30 years. It is due to the invention of miracle called CFC chemicals.

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9y ago

Ozone is depleting in the last twenty years. It is due to synthetic chemicals.

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12y ago

It has grown dramatically in the past 30 years.

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9y ago

In the past three years, ozone has depleted. It is because of the use of CFC's.

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8y ago

The ozone has been decreasing since 1970's. Is due to the increasing industrialization.

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When was the massive hole in the ozone layer over the Antarctica first discovered?

The ozone hole first appeared when the ozone layer first appeared. The only variable is the "size" of the hole, and the ozone concentration in the "hole". The pole of the Earth that is experiencing winter receives none of the UV that makes ozone (for like a month or more), and ozone naturally decays with time. TThe ozone hole is a normal feature of our ozone layer. It appears each year when it is winter at one of our poles. So it first appeared when the ozone layer appeared. We first noticed the ozone hole in 1985, above Antartica. One forms over the Arctic pole too when it is winter there. They heal closed again once sunlight reaches the pole. Its not so much the presence or absence of an ozone hole, but its size that is important. It is important to look out for the ozone hole


Which blocks are harmful ultraviolet rays from the Sun?

The ozone layer blocks most of the sun's harmful ultraviolet rays. The ozone layer has thinned over time in certain areas due to emissions of ozone depleting chemicals widely used in industry.


How much of the ozone layer do you have right now?

The "ozone layer" is roughly the same condition it has always been in. The amount of ozone in the upper atmosphere varies mainly due to variations in solar activity. UV radiation has serious affects on this layer. Holes form over the poles at the end of each winter due to a lack of sunlight. When the sun returns, the "holes" quickly disappear.


What layer is the ozone a part of?

You can find ozone in any layer of the atmosphere, but in the lower layers it does not last long. The so-called ozone layer is in the lower portion of the stratosphere, at a height where it takes a long time to dissociate.


What era was the ozone layer developed?

In the Precambrian time, 4.6 billion yrs. ago

Related questions

How has the surface of the Earth changed?

its changed over time by tectonic plates shifting.


What has this issue changed over time with the ozone?

The ozone issue has changed with time. The use of CFC first depleted the ozone but now it is stable.


Has the ozone layer shifted over time?

Yes, the ozone has shifted over time. It changes with weather each season.


How do alternative fuels affect the ozone layer?

The main damage to the ozone layer was caused by freons, with the layer thinning to such an extent over Antarctica that it was referred to as the'ozone hole'. Fortunately, the industrial use of freons was banned, perhaps just in time, and the ozone layer is recovering. Alternative fuels are unlikely to affect this recovery.


When was the massive hole in the ozone layer over the Antarctica first discovered?

The ozone hole first appeared when the ozone layer first appeared. The only variable is the "size" of the hole, and the ozone concentration in the "hole". The pole of the Earth that is experiencing winter receives none of the UV that makes ozone (for like a month or more), and ozone naturally decays with time. TThe ozone hole is a normal feature of our ozone layer. It appears each year when it is winter at one of our poles. So it first appeared when the ozone layer appeared. We first noticed the ozone hole in 1985, above Antartica. One forms over the Arctic pole too when it is winter there. They heal closed again once sunlight reaches the pole. Its not so much the presence or absence of an ozone hole, but its size that is important. It is important to look out for the ozone hole


How ozone layer recover in summer in south poles?

Ozone layer forms in summer. therefore it initiates its recovery at that time.


Which blocks are harmful ultraviolet rays from the Sun?

The ozone layer blocks most of the sun's harmful ultraviolet rays. The ozone layer has thinned over time in certain areas due to emissions of ozone depleting chemicals widely used in industry.


How did the aerosol can change over time?

They use hydrocarbons now; they used to use chlorofluorocarbons (CFC's) which were damaging to the ozone layer.


How much of the ozone layer do you have right now?

The "ozone layer" is roughly the same condition it has always been in. The amount of ozone in the upper atmosphere varies mainly due to variations in solar activity. UV radiation has serious affects on this layer. Holes form over the poles at the end of each winter due to a lack of sunlight. When the sun returns, the "holes" quickly disappear.


Will you die when the ozone layer breaks?

Yes, you will. There is a lot of time until the ozone breaks up.


What layer is the ozone a part of?

You can find ozone in any layer of the atmosphere, but in the lower layers it does not last long. The so-called ozone layer is in the lower portion of the stratosphere, at a height where it takes a long time to dissociate.


What time frame did the ozone layer deplete the most?

The ozone deplete when the world was unaware about it. That is when CFC's were born.