• SkillCat Team

The Ozone Layer

Updated: 2 days ago

EPA 608 Core Chapter 2 (Take full course for free)


In this module, we will introduce the Ozone layer and talk about how it is essential to life on Earth. Skip to quiz!


1. Introduction to Ozone


Recall that an atom is the basic building block of all things. Ozone is a naturally occurring gas, made up of 3 oxygen atoms bonded together.


Earth’s atmosphere is made up of several layers, as shown.


Ozone is found in the lowest two layers of Earth’s atmosphere, the Troposphere and the Stratosphere.



2. Formation of Ozone


Recall that the Oxygen found in air is a gas made of two Oxygen atoms.


In the atmosphere, the sun’s high energy rays break the bond between two oxygen molecules. These free oxygen atoms then bond with pairs of oxygen atoms to form Ozone.



As mentioned in the video, Ozone is found in the Troposphere and the Stratosphere.


The highest concentration of Ozone is found in the Stratosphere. Ozone found in this region is called the Ozone Layer.


3. Function of Ozone


Ultraviolet (UV) radiation from the sun is constantly hitting earth and is harmful for humans. The main function of Ozone is to absorb and reflect ultraviolet radiation. This occurs in the Ozone Layer in the Stratosphere.


Ozone is also found at ground level, also known as the troposphere, mainly in the form of smog. This type of ozone is created by chemical reactions from pollutant emissions and sunlight.


At ground level, it is considered a harmful pollutant because of its effects on humans and the environment. In humans, it can cause damage to lungs when inhaled. In the environment, it damages plant life in increased amounts.


To summarize, there are two types of ozone:

1. Stratospheric ozone - This ozone performs the essential function of absorbing and reflecting harmful UV rays from the sun.

2. Ground level ozone - This ozone is harmful to humans’ health.


4. Conclusion


Ozone occurs naturally in the Stratosphere and Troposphere, with the highest concentration found in the Stratosphere. Ozone is essential to life on Earth because it absorbs and reflects harmful UV rays from the sun.


Question #1: Ozone has __ molecules of oxygen.

  1. 2

  2. 3

  3. 8

  4. 10

Scroll down for the answer...
















Ozone is composed of 3 molecules of oxygen.


Question #2: What is the major function of ozone in the stratosphere?

  1. Absorb and reflect UV rays from the sun

  2. Create UV rays by using rays from the sun

  3. Direct UV rays from the sun to humans

  4. Convert UV rays into energy for humans


Scroll down for the answer...










Absorb and reflect UV rays from the sun! Ozone is essential to life on earth because it absorbs and reflects harmful UV rays from the sun.


Question #3: Ground level ozone is what absorbs and reflects harmful UV rays from the sun.

  1. True

  2. False

Scroll down for the answer...













False! Ozone in the Stratosphere absorbs and reflects harmful UV rays from the sun, not ground level ozone. Ground level ozone is actually harmful for humans when inhaled.


Question #4: The majority of ozone is located in the Troposphere.

  1. True

  2. False

Scroll down for the answer...













False! The majority of ozone is located in the Stratosphere, not the Troposphere.

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