Ozone Depletion 101
Far above Earth's surface, the ozone layer helps to protect life from harmful ultraviolet radiation. Learn what CFCs are, how they have contributed to the ozone hole, and how the 1989 Montreal Protocol sought to put an end to ozone depletion.
Conservation, Earth Science, Climatology, Meteorology
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ENCYCLOPEDIC ENTRY
Ozone layer.
The ozone layer is one layer of the stratosphere, the second layer of Earth’s atmosphere. The stratosphere is the mass of protective gases clinging to our planet.
Health, Earth Science, Geography, Physical Geography
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The ozone layer is one layer of the stratosphere , the second layer of Earth’s atmosphere . The stratosphere is the mass of protective gases clinging to our planet. The stratosphere gets its name because it is stratified, or layered: as elevation increases, the stratosphere gets warmer. The stratosphere increases in warmth with elevation because ozone gases in the upper layers absorb intense ultraviolet radiation from the sun. Ozone is only a trace gas in the atmosphere—only about three molecules for every 10 million molecules of air. But it does a very important job. Like a sponge , the ozone layer absorbs bits of radiation hitting Earth from the sun. Even though we need some of the sun's radiation to live, too much of it can damage living things. The ozone layer acts as a shield for life on Earth. Ozone is good at trapping a type of radiation called ultraviolet radiation, or UV light, which can penetrate organisms’ protective layers, like skin . This then may damage DNA molecules in plants and animals. There are two major types of UV light: UVB and UVA. UVB is the cause of skin conditions like sunburns, and cancers like basal cell carcinoma and squamous cell carcinoma. People used to think that UVA light, the radiation used in tanning beds, is harmless because it doesn’t cause burns. However, scientists now know that UVA light is even more harmful than UVB, penetrating more deeply and causing a deadly skin cancer, melanoma , and premature aging. The ozone layer, Earth’s sunscreen, absorbs about 98 percent of this devastating UV light. The ozone layer is getting thinner. Chemicals called chlorofluorocarbons (CFCs) are a reason we have a thinning ozone layer. A CFC is a molecule that contains the elements carbon, chlorine, and fluorine. CFCs are everywhere, mostly in refrigerants and plastic products. Businesses and consumers use them because they're inexpensive, they don't catch fire easily, and they don't usually poison living things. But the CFCs start eating away at the ozone layer once they get blown into the stratosphere. Ozone molecules, which are simply made of three joined oxygen atoms, are always being destroyed and reformed naturally. But CFCs in the air make it very difficult for ozone to reform once it’s broken apart. The ozone layer, which only makes up 0.00006 percent of Earth’s atmosphere, is getting thinner and thinner all the time. “ Ozone holes ” are popular names for areas of damage to the ozone layer. This is inaccurate . Ozone layer damage is more like a really thin patch than a hole. The ozone layer is thinnest near the poles . In the 1970s, people all over the world started realizing the ozone layer was getting thinner and that this was a bad thing. Many governments and businesses agreed that some chemicals, like aerosol cans , should be outlawed . There are fewer aerosol cans produced today. The ozone layer has slowly recovered as people, businesses, and governments work to control such pollution .
Million to One Compared to other gases in the atmosphere, ozone is pretty rare. According to NOAA, there are only about three molecules of ozone for every ten million molecules of air.
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Free PowerPoints for Kids & Teachers – The Ozone Layer
Did You Know?
The ozone layer is a band in the upper atmosphere. Ozone is a molecule made of three atoms of oxygen instead of the usual two atoms. The ozone layer absorbs harmful ultraviolet radiation from the sun and is very important to life on earth.
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See Also: The Atmosphere , Environmental Science , Pollution , Global Warming , Science Index
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- Biology Article
Ozone Layer Depletion
Ozone layer and its depletion, ozone layer definition.
“The ozone layer is a region in the earth’s stratosphere that contains high concentrations of ozone and protects the earth from the harmful ultraviolet radiations of the sun.”
Table of Contents
What is an Ozone Layer?
What is ozone layer depletion, causes of ozone layer depletion, ozone depleting substances (ods), effects of ozone layer depletion, solutions to ozone layer depletion.
The ozone layer is mainly found in the lower portion of the earth’s atmosphere. It has the potential to absorb around 97-99% of the harmful ultraviolet radiations coming from the sun that can damage life on earth. If the ozone layer was absent, millions of people would develop skin diseases and may have weakened immune systems.
However, scientists have discovered a hole in the ozone layer over Antarctica. This has focussed their concern on various environmental issues and steps to control them. The main reasons for the ozone hole are chlorofluorocarbons, carbon tetrachloride, methyl bromide and hydrochlorofluorocarbons.
Let us have a detailed look at the various causes and effects of ozone layer depletion.
“Ozone layer depletion is the gradual thinning of the earth’s ozone layer in the upper atmosphere caused due to the release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities.”
Ozone layer depletion is the thinning of the ozone layer present in the upper atmosphere. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules. One chlorine can destroy 100,000 molecules of ozone. It is destroyed more quickly than it is created.
Some compounds release chlorine and bromine on exposure to high ultraviolet light, which then contributes to ozone layer depletion. Such compounds are known as Ozone Depleting Substances (ODS).
The ozone-depleting substances that contain chlorine include chlorofluorocarbon, carbon tetrachloride, hydrochlorofluorocarbons, and methyl chloroform. Whereas, the ozone-depleting substances that contain bromine are halons, methyl bromide, and hydro bromofluorocarbons.
Chlorofluorocarbons are the most abundant ozone-depleting substance. It is only when the chlorine atom reacts with some other molecule, it does not react with ozone.
Montreal Protocol was proposed in 1987 to stop the use, production and import of ozone-depleting substances and minimise their concentration in the atmosphere to protect the ozone layer of the earth.
Also Read: Environmental Issues
Ozone layer depletion is a major concern and is associated with a number of factors. The main causes responsible for the depletion of the ozone layer are listed below:
Chlorofluorocarbons
Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc.
The molecules of chlorofluorocarbons in the stratosphere are broken down by ultraviolet radiations and release chlorine atoms. These atoms react with ozone and destroy it.
Unregulated Rocket Launches
Researches say that the unregulated launching of rockets results in much more depletion of the ozone layer than the CFCs do. If not controlled, this might result in a huge loss of the ozone layer by the year 2050.
Nitrogenous Compounds
The nitrogenous compounds such as NO 2 , NO, N 2 O are highly responsible for the depletion of the ozone layer.
Natural Causes
The ozone layer has been found to be depleted by certain natural processes such as Sun-spots and stratospheric winds. But it does not cause more than 1-2% of the ozone layer depletion.
The volcanic eruptions are also responsible for the depletion of the ozone layer.
“Ozone-depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. that are responsible for the depletion of the ozone layer.”
Following is the list of some main ozone-depleting substances and the sources from where they are released:
|
| |
| Chlorofluorocarbons (CFCs) | Refrigerators, air-conditioners, solvents, dry-cleaning agents, etc. |
| Halons | Fire-extinguishers |
| Carbon tetrachloride | Fire extinguishers, solvents |
| Methyl chloroform | Adhesives, aerosols |
| Hydrofluorocarbons | fire extinguishers, air-conditioners, solvents |
Also Read: Global Warming
The depletion of the ozone layer has harmful effects on the environment. Let us see the major effects of ozone layer depletion on man and environment.
Effects on Human Health
Humans will be directly exposed to the harmful ultraviolet radiation of the sun due to the depletion of the ozone layer. This might result in serious health issues among humans, such as skin diseases, cancer , sunburns, cataract, quick ageing and weak immune system.
Effects on Animals
Direct exposure to ultraviolet radiations leads to skin and eye cancer in animals.
Effects on the Environment
Strong ultraviolet rays may lead to minimal growth, flowering and photosynthesis in plants. The forests also have to bear the harmful effects of the ultraviolet rays.
Effects on Marine Life
Planktons are greatly affected by the exposure to harmful ultraviolet rays. These are higher in the aquatic food chain. If the planktons are destroyed, the organisms present in the food chain are also affected.
The depletion of the ozone layer is a serious issue and various programmes have been launched by the government of various countries to prevent it. However, steps should be taken at the individual level as well to prevent the depletion of the ozone layer.
Following are some points that would help in preventing this problem at a global level:
Avoid Using ODS
Reduce the use of ozone depleting substances. E.g. avoid the use of CFCs in refrigerators and air conditioners, replacing the halon based fire extinguishers, etc.
Minimise the Use of Vehicles
The vehicles emit a large amount of greenhouse gases that lead to global warming as well as ozone depletion. Therefore, the use of vehicles should be minimised as much as possible.
Use Eco-friendly Cleaning Products
Most of the cleaning products have chlorine and bromine releasing chemicals that find a way into the atmosphere and affect the ozone layer. These should be substituted with natural products to protect the environment.
Use of Nitrous Oxide should be Prohibited
The government should take actions and prohibit the use of harmful nitrous oxide that is adversely affecting the ozone layer. People should be made aware of the harmful effects of nitrous oxide and the products emitting the gas so that its use is minimised at the individual level as well.
Frequently Asked Questions
What is ozone layer depletion how does it occur.
The thinning of the ozone layer present in the upper atmosphere is called ozone layer depletion. Some chemical compounds release chlorine and bromine, which in exposure to high ultraviolet light causes the depletion of ozone.
What are ozone-depleting substances? Give examples.
The chemical substances which are responsible for depletion of the earth’s protective ozone layer are called ozone-depleting substances (ODS). Examples are halons, chlorofluorocarbons, hydrofluorocarbons, carbon tetrachloride etc.
What is the main aim of the Montreal Protocol?
The Montreal Protocol is a global agreement which was proposed in the year 1987. The agreement focuses on protecting the ozone layer by minimising the production and consumption of ozone-depleting substances.
What are the effects of ozone layer depletion on human health?
Ozone layer helps in shielding the harmful ultraviolet rays of the sun. Depletion of the ozone layer exposes humans to harmful ultraviolet rays, this causes skin diseases, cataract, cancer, impaired immune system etc.
For more detailed information on the ozone layer, ozone layer depletion, causes, effects and solutions to ozone layer depletion, keep visiting BYJU’S website or download the BYJU’S app for further reference.
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| - | Depletion of Ozone Layer 6S Yeung Wut Pan 6S Tsang Chi Ho |
| - | What is ozone layer? a layer in Earth’s atmosphere contains relatively high concentrations of ozone (O3) absorbs 93-99% of the sun's high frequency ultraviolet light located in the lower portion of the stratosphere |
| - | The following equations describe how ozone is formed- O2 ------------O + O O+ O2 ------------O3 |
| - | Ozone and ultraviolet Ultraviolet is a kind of radiation Divided into three categories Harmful to humans Absorbed and screened by ozone |
| - | What caused ozone depletion? By free radical catalysts Emissions from jumbo jets and civil aircraft increased concentrations of chlorine and bromine, nitrogen oxides, and hydrogen liberated by the action of ultraviolet light initiate and catalyze a chain reaction |
| - | How the ozone layer is destroyed? CFCs (chlorofluorocarbons) commonly used in refrigeration and aerosol broken down by UV radiation and give out chlorine atoms which acts as the catalyst: CFCl3---------CFCl2 + Cl Cl +O3 ------- ClO +O2 ClO +O ------- Cl +O2 The Cl atom is then used again to destroy more ozone molecules. |
| - | ppt slide no 7 content not found |
| - | Where does the most ozone depletion occur? A very large ozone hole forms at Antarctica. November 27, 2008 |
| - | Results of ozone layer depletion Ozone levels drop being unable to absorb ultraviolet radiation an increase of skin cancer and eye cataract yield of crops decrease Economic loss global warming |
| - | What have been done? Monitor the use of CFCs Compounds containing C–H bonds designed to replace CFCs Lower sulphur jet aircraft fuel and redesigned engines Reduce vehicles’ exhaust emissions Develop less polluting propulsion systems |
| - | Is the ozone layer recovering? The report from United Nations Environmental Programme in 2006 states that the Montreal Protocol is working. The ozone layer is expected to recover to pre-1980 levels in 2050. If all emissions of ozone depleting substances were eliminated, the recovery will advance by 15 years. |
| - | What can we do to help? Use no CFCs items Conduct regular inspection and maintenance of air-conditioning and refrigeration appliances CFCs containing items should be recovered or recycled |
| - | Sources http://www.nasa.gov/vision/earth/environment/ozone_resource_page.html http://www.epd.gov.hk/epd/textonly/english/environmentinhk/air/ozone_layer_protection/wn6_protect.html http://esrl.noaa.gov/csd/assessments/2002/qandas.html http://ozone.unep.org/index.shtml |
| - | The end |
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World Ozone Day Minitheme
It seems that you like this template, world ozone day minitheme presentation, free google slides theme, powerpoint template, and canva presentation template.
The Ozone Layer protects us from the Sun's ultraviolet radiation. It's crucial for life on Earth, so we need to stop its depletion as soon as possible. This cheerful template will motivate your audience to take action thanks to its blue tones and the big amount of illustrations in the form of stickers. They're great to reach an audience of all ages! Try to provide as much info as possible: health effects, atmosphere, potential solutions to the Ozone Layer depletion, etc.
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15 Best Ozone-Themed Templates for PowerPoint & Google Slides
With over 6 million presentation templates available for you to choose from, crystalgraphics is the award-winning provider of the world’s largest collection of templates for powerpoint and google slides. so, take your time and look around. you’ll like what you see whether you want 1 great template or an ongoing subscription, we've got affordable purchasing options and 24/7 download access to fit your needs. thanks to our unbeatable combination of quality, selection and unique customization options, crystalgraphics is the company you can count on for your presentation enhancement needs. just ask any of our thousands of satisfied customers from virtually every leading company around the world. they love our products. we think you will, too" id="category_description">crystalgraphics creates templates designed to make even average presentations look incredible. below you’ll see thumbnail sized previews of the title slides of a few of our 15 best ozone templates for powerpoint and google slides. the text you’ll see in in those slides is just example text. the ozone-related image or video you’ll see in the background of each title slide is designed to help you set the stage for your ozone-related topics and it is included with that template. in addition to the title slides, each of our templates comes with 17 additional slide layouts that you can use to create an unlimited number of presentation slides with your own added text and images. and every template is available in both widescreen and standard formats. with over 6 million presentation templates available for you to choose from, crystalgraphics is the award-winning provider of the world’s largest collection of templates for powerpoint and google slides. so, take your time and look around. you’ll like what you see whether you want 1 great template or an ongoing subscription, we've got affordable purchasing options and 24/7 download access to fit your needs. thanks to our unbeatable combination of quality, selection and unique customization options, crystalgraphics is the company you can count on for your presentation enhancement needs. just ask any of our thousands of satisfied customers from virtually every leading company around the world. they love our products. we think you will, too.
Widescreen (16:9) Presentation Templates. Change size...
A person with a representation of ozone layer
Slides featuring cropped hands of caucasian woman holding earth with day for preservation of the ozone layer text digital composite copy space spread awareness protection phase out ozone depleting substances
Presentation theme consisting of overheat planet global warming
Presentation theme enhanced with concept of industrial madness pollution killing life
PPT theme enhanced with chimney of an industrial company with a strong smoke symbolic photo for environmental protection and ozone background
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By providing your email address below, you agree to receive the requested Investor Email Alert updates from Ozon Holdings PLC. Investor Relations website contains information about Ozon Holdings PLC (NASDAQ: OZON and MOEX:OZON) business for stockholders, bondholders, potential investors, financial analysts, and other stakeholders.
Far above Earth's surface, the ozone layer helps to protect life from harmful ultraviolet radiation. Learn what CFCs are, how they have contributed to the oz...
Chapter 20. Climate Change and Ozone Depletion. PAST CLIMATE AND THE GREENHOUSE EFFECT. Over the past 900,000 years, the troposphere has experienced prolonged periods of global cooling and global warming. For the past 1,000 years, temperatures have remained fairly stable but began to rise during the last century. Rise in global temp last 150 yrs.
size of the holes in our "bucket" of ozone. The larger holes cause ozone to leak out at a faster rate than ozone is being created. Consequently, the level of ozone protecting us from ultraviolet radiation decreases. The ozone destroyed by manmade emissions is comparable or more than the amount de-stroyed by natural processes.
Ozone Depletion 101. Far above Earth's surface, the ozone layer helps to protect life from harmful ultraviolet radiation. Learn what CFCs are, how they have contributed to the ozone hole, and how the 1989 Montreal Protocol sought to put an end to ozone depletion.
The Earth's atmosphere is composed of three regions: 1. troposphere, which extends up to about ten kilometres from the Earth's surface; kilometres from the Earth's surface; and3. the ionosphere, whi. h extends up to 350 kilometres from Earth.Most ozone (appro. imately 90%) is found in the stratosphere. This stratospheric ozone.
The Ozone layer is a layer of oxygen gas with the atoms put together in a special way. It is found about 19-30km up in the stratosphere. The Ozone layer is often in the news because humans are damaging it and we, plants and animals would die without it. We damage it with the chemicals that we use, this could be prevented.
Ozone. is a gas made up of molecules that are formed by three oxygen atoms. Its molecular formula is O3. Ozone is formed when the sunlight hits oxygen molecules (O2) and breaks them up into individual atoms. These individual atoms then join up with O2 molecules and make O3, or ozone. While the remaining 10% of ozone is present in lower layer of ...
The ozone layer is one layer of the stratosphere, the second layer of Earth's atmosphere.The stratosphere is the mass of protective gases clinging to our planet. The stratosphere gets its name because it is stratified, or layered: as elevation increases, the stratosphere gets warmer. The stratosphere increases in warmth with elevation because ozone gases in the upper layers absorb intense ...
Ozone is a molecule made of three atoms of oxygen instead of the usual two atoms. The ozone layer absorbs harmful ultraviolet radiation from the sun and is very important to life on earth. Free Presentations in PowerPoint format
Our beloved ozone layer... It is a crucial part of the atmosphere that protects the Earth from the sun's harmful ultraviolet rays. Every September 16 is World Ozone Day, an event that seeks to raise public awareness about the importance of protecting the ozone layer and promote measures to reduce the emission of substances that damage it. Now ...
Stratosphere: The highest level of the Earth's atmosphere, extending from 10 kilometers (6 miles) to 50 kilometers (31 miles) above the surface of the Earth. The 10% of ozone that remains is found in the troposphere. This stratospheric region is where the highest concentration of Ozone is found. This is commonly known as the 'ozone layer'.
Ozone layer helps in shielding the harmful ultraviolet rays of the sun. Depletion of the ozone layer exposes humans to harmful ultraviolet rays, this causes skin diseases, cataract, cancer, impaired immune system etc. For more detailed information on the ozone layer, ozone layer depletion, causes, effects and solutions to ozone layer depletion ...
This helps you give your presentation on Depletion of Ozone Layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representations. The uploader spent his/her valuable time to create this Depletion of Ozone Layer powerpoint presentation slides, to share his/her useful content with the world.
World Ozone Day Minitheme Presentation. Free Google Slides theme, PowerPoint template, and Canva presentation template. The Ozone Layer protects us from the Sun's ultraviolet radiation. It's crucial for life on Earth, so we need to stop its depletion as soon as possible. This cheerful template will motivate your audience to take action thanks ...
CrystalGraphics creates templates designed to make even average presentations look incredible. Below you'll see thumbnail sized previews of the title slides of a few of our 15 best ozone templates for PowerPoint and Google Slides. The text you'll see in in those slides is just example text. The ozone-related image or video you'll see in ...
From January 1, 2023, we revised the presentation of our statement of profit or loss and other comprehensive income as described in note 2.4, "Changes in Presentation and Reclassifications," to Ozon Holdings PLC's consolidated financial statements for the years ended December 31, 2023, 2022 and 2021.