The phrase "an Ozone layer" is not correct; it should be "the ozone layer." You can use "the ozone layer" when referring to the specific layer of ozone in the Earth's stratosphere that absorbs most of the sun's harmful ultraviolet radiation.
Example: "The ozone layer plays a crucial role in protecting life on Earth from harmful UV rays."
Alternatives: "the layer of ozone" or "ozone-rich layer."
Dr. Thiemens said the lack of an ozone layer on Mars was a more likely explanation.
They were relatively resistant to ultraviolet radiation and thus were able to survive during Earth's early history when the atmosphere lacked an ozone layer.
* i'm dreaming of an ozone layer, Just like the one I used to know, Which kept out UV rays, Before aerosol sprays, And allowed for actual snow.
While applying it to study the light spectra of the Sun and stars, Fabry demonstrated that solar ultraviolet radiation is filtered out by an ozone layer in the upper atmosphere.
The absence of an ozone layer would have allowed the light to pass through the atmosphere.
In the late 1980s, satellites began to track an increase in UV radiation passing through an ozone layer thinned by synthetic chlorofluorocarbons.
The Earth has a primary, a secondary and a tertiary ozone layer, all of which are shown in Fig. 4a, b.
Chemical spills, radiation leakage, broken mountaintops, plastic waste that will never decompose, a depleted ozone layer, a floating garbage dump in the Pacific Ocean the size of a continent -- all this, and so much more, are the result of normal life in the 21st century.
In 2011, the spacecraft discovered that Venus has a thin ozone layer at an altitude of 100 km.
It has been determined that for the generation of a protective ozone layer only a small amount of oxygen (0.1 of the present atmospheric levels) is sufficient (Kasting and Donahue 1980).
For instance, oxygen production, which leads to an atmospheric ozone layer that protects evolving organisms from ultraviolet radiation, depends on how much radiation the star emits, which is a function of its mass and lifetime.
