Question

Most of the atmospheric Ozone is found in which layer of the atmosphere?
1. Stratosphere
2. Thermosphere
3. Mesosphere
4. Troposphere

Answer 1

Correct Answer - Option 1 : Stratosphere

The Correct Answer is Stratosphere.

  

• Ninety percent of the ozone in the atmosphere is occupied by the stratosphere, the layer of the atmosphere between about 10 and 50 kilometers altitude.
• The natural level of ozone in the stratosphere is a result of a balance between sunlight that creates ozone and chemical reactions that destroy it.
• The Earth's atmosphere consists of several layers.
  • The lowest layer, the troposphere, extends from the Earth's surface up to about 6 miles or 10 kilometers in altitude. 
  •  The next layer, the stratosphere, continues from 6 miles to about 31 miles. 
  • Ozone is a molecule that contains three oxygen atoms.
    •    Ozone molecules are constantly formed and destroyed in the stratosphere. 
    • The ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface. 
    • It absorbs the portion of the UV light called UVB.

   

Thermosphere:-

• The thermosphere is the layer in the Earth's atmosphere directly above the mesosphere and below the exosphere.
• Within this layer of the atmosphere, ultraviolet radiation causes photoionization/photodissociation of molecules, creating ions, the thermosphere thus constitutes the larger part of the ionosphere.

Mesosphere:-

• The mesosphere is directly above the stratosphere and below the thermosphere.
• It extends from about 31 to 53 miles above our planet.
• Temperature decreases with height throughout the mesosphere.

Troposphere:-

• The troposphere is the lowest layer of Earth's atmosphere and the site of all weather on Earth.
• The troposphere is bounded on the top by a layer of air called the tropopause, which separates the troposphere from the stratosphere, and on the bottom by the surface of the Earth.