Ozone

Definition

Ozone is a molecule composed of three oxygen atoms (O3). It plays a crucial role in absorbing and scattering ultraviolet radiation from the Sun in Earth's atmosphere.

5 Must Know Facts For Your Next Test

1. Ozone is most concentrated in the stratosphere, forming the ozone layer.
2. The ozone layer absorbs the majority of the Sun's harmful ultraviolet (UV) radiation.
3. Ozone can also be found at ground level as a pollutant, contributing to smog.
4. Human activities have led to ozone depletion primarily through the release of chlorofluorocarbons (CFCs).
5. The recovery of the ozone layer is a significant focus of international environmental agreements such as the Montreal Protocol.

Review Questions

• What role does ozone play in Earth's atmosphere?
• Where is the concentration of ozone highest within Earth's atmosphere?
• How have human activities impacted the levels of atmospheric ozone?

Related terms

Stratosphere:

The second major layer of Earth's atmosphere, located above the troposphere and below the mesosphere.

Ultraviolet Radiation:

A type of electromagnetic radiation from the Sun that can cause skin cancer and other health issues but is largely absorbed by the ozone layer.

Chlorofluorocarbons (CFCs): Chemical compounds used in aerosols and refrigerants that contribute significantly to ozone depletion.