PREVIOUSLY ASKED IN:
WBPSC Miscellaneous Preliminary 2019
Answer
Stratosphere
Explanation
The highest concentration of ozone gas (O3) is found in the Stratosphere layer of the Earth's atmosphere. This specific region is commonly referred to as the 'Ozone Layer' or Ozonosphere, situated approximately 15 to 30 kilometers above the Earth's surface. This vital layer acts as a protective shield by absorbing the majority of the sun's harmful ultraviolet (UV) radiation, protecting life on Earth.
Key Points
- > The Troposphere is the lowest layer where all weather phenomena (clouds, rain, storms) occur.
- > Commercial jet planes prefer to fly in the lower Stratosphere to avoid weather turbulence.
- > Meteors from space burn up upon entering the Mesosphere due to friction.
- > The Thermosphere (specifically the Ionosphere) reflects radio waves back to Earth.
- > Chlorofluorocarbons (CFCs) are the primary ozone-depleting substances responsible for the 'ozone hole'.
Additional Information
Layers of the Atmosphere & Characteristics
| Layer Name | Altitude (Approx) | Key Feature / Function |
|---|---|---|
| Troposphere | 0 - 15 km | Weather changes, cloud formation |
| Stratosphere | 15 - 50 km | Ozone layer, commercial jets fly here |
| Mesosphere | 50 - 80 km | Coldest layer, meteors burn up here |
| Thermosphere | 80 - 400 km | Auroras occur, reflects radio waves |
| Exosphere | > 400 km | Artificial satellites orbit here |
Memory Tips
- Stratosphere = Shields from UV (Ozone).
- Mesosphere = Meteors.
- Thermosphere = Temperature goes extremely high, and Transmissions (radio waves) bounce off.