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There are five main atmospheric layers:

1. The Troposphere: This is the lowest layer and extends from the Earth's surface to an altitude of 7 to 20 kilometers. This is where the weather occurs and where most of the Earth's mass is located.
2. The Stratosphere: This layer extends from the top of the troposphere to an altitude of 50 kilometers. The ozone layer is located in this layer.
3. The Mesosphere: This layer is located above the stratosphere and extends from 50 to 80 kilometers in altitude. Meteoroids burn up in this layer, creating shooting stars.
4. The Thermosphere: This layer extends from 80 to 600 kilometers and is home to the Northern and Southern lights. This layer is also where the ionosphere is located.
5. The Exosphere: This is the outermost layer and extends from the top of the thermosphere to the edge of space. This layer is where the Earth's atmosphere blends into space.

The ozone layer is a layer of ozone gas located in the stratosphere. It acts as a shield, protecting life on Earth from the harmful ultraviolet radiation from the sun. The ozone layer has been depleted in recent decades due to the emission of chemicals such as chlorofluorocarbons (CFCs). This has led to increased levels of ultraviolet radiation reaching the Earth's surface, causing health problems and environmental damage.