Question

Where is the ozone layer located in the atmosphere ?

• A. Troposphere
• B. Stratosphere
• C. Mesosphere
• D. Ionosphere

Hint:

Remember that "Good ozone" is located in the Stratosphere where it shields the Earth from harmful UV rays, whereas "Bad ozone" is located in the Troposphere where it acts as a pollutant.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The Earth's atmosphere is divided into distinct layers based on temperature gradients: Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere.
Each layer has a different composition of gases and plays a unique role in protecting life on Earth.

Step 2: Detailed Explanation:
The ozone layer is a region of high ozone (\(O_3\)) concentration located in the Stratosphere.
It is situated approximately 15 to 35 kilometers above the Earth's surface.
Ozone is formed in this layer through the interaction of ultraviolet (UV) radiation with oxygen (\(O_2\)) molecules.
This layer is crucial for life on Earth because it absorbs 97% to 99% of the sun's medium-frequency ultraviolet light (specifically UV-B rays).
Without this protective ozone shield, high levels of UV radiation would reach the Earth's surface, causing skin cancers, cataracts, and severe ecological damage to terrestrial and aquatic ecosystems, including marine phytoplankton.
The troposphere is the lowest layer where weather occurs, the mesosphere lies above the stratosphere, and the ionosphere is part of the upper thermosphere.

Step 4: Final Answer:
The ozone layer is located in the Stratosphere.