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Chapter 33: Problem 55

Which one of the following regions of atmosphere contains ozone? (a) troposphere (b) stratosphere (c) mesosphere (d) thermosphere

Short Answer

Expert verified
The ozone is primarily located in the stratosphere.

Step by step solution

01

Understanding Ozone's Location

Ozone, a molecule composed of three oxygen atoms, is critical for protecting the Earth from harmful ultraviolet (UV) radiation. It exists primarily in a layer or region of the Earth's atmosphere.
02

Identifying Atmospheric Layers

The Earth's atmosphere is divided into several layers based on temperature gradients. These layers are, in order from the ground up: troposphere, stratosphere, mesosphere, and thermosphere.
03

Locating the Ozone Layer

The bulk of Earth's ozone is found in the stratosphere, a layer situated above the troposphere and below the mesosphere. This is known as the ozone layer, where the concentration of ozone is significantly higher than in other parts of the atmosphere.
04

Conclusion

Since ozone is predominantly found in the stratosphere, it acts as a shield absorbing most of the sun's harmful ultraviolet radiation. Thus, the correct answer to which region contains ozone is the stratosphere.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Stratosphere
The stratosphere is the second layer of Earth's atmosphere and plays a pivotal role in both weather patterns and the survival of life on Earth. Positioned just above the troposphere, this layer extends from approximately 10 kilometers to about 50 kilometers above the Earth's surface.
The stratosphere is known for its relatively stable air, as there is less turbulence compared to the troposphere. One of its most crucial features is the ozone layer, which is located within this part of the atmosphere.
This layer absorbs and scatters the solar ultraviolet radiation, making it essential for shielding life on Earth from harmful UV rays.
Atmospheric Layers
The Earth's atmosphere is a complicated system composed of layers, each with unique characteristics and functions. These layers are defined by temperature changes as you ascend through the atmosphere.
The main layers include:
  • Troposphere: The lowest layer, where all weather conditions occur and where humans generally live.
  • Stratosphere: Above the troposphere, featuring the ozone layer, known for its role in blocking ultraviolet radiation.
  • Mesosphere: This layer lies above the stratosphere and is where meteors generally burn up upon entering Earth's atmosphere.
  • Thermosphere: Characterized by high temperatures, this layer features the auroras and is where the International Space Station orbits.
Understanding these layers helps to appreciate how the atmosphere works as a complex protective barrier around our planet.
Ultraviolet Radiation Protection
Ultraviolet (UV) radiation is a form of electromagnetic energy primarily sourced from the sun. While some UV exposure is beneficial, helping in the production of vitamin D, excessive UV radiation can pose significant risks to human health, leading to skin cancers and other ailments.
The ozone layer, primarily found in the stratosphere, acts as a powerful shield against these harmful rays. It absorbs the majority of the sun鈥檚 damaging UV radiation, protecting life on Earth.
Here's how the ozone layer provides protection:
  • Absorption: Ozone molecules absorb UV radiation and convert it into heat, preventing most harmful rays from reaching the Earth's surface.
  • Balance: A healthy ozone layer allows beneficial UV levels to enable important processes, like vitamin D production in humans, while blocking the excessive levels that pose threats.
Preserving the ozone layer is crucial for maintaining this natural defense against hazardous ultraviolet radiation.

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