Ozone Layer by Girishwar
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The document discusses the importance of the ozone layer in protecting life on Earth from harmful ultraviolet radiation and highlights the destructive impact of ozone-depleting substances (ODS) such as chlorofluorocarbons (CFCs). It outlines the formation and role of ozone in the atmosphere, the emergence of ozone holes, and the consequences of ozone depletion on human health and the environment. Finally, it suggests measures to mitigate ozone depletion, including reducing the use of ODS and adopting eco-friendly practices.
Ozone Layer by Girishwar
- 1. INOVIT-2015 SOUTH INDIA LEVEL SCIENCE CONTEST FOR SCHOOL CHILDREN Venue: VIT University, Vellore-632 014, Tamil Nadu 24-25, January 2015 1
- 2. PARTICIPATOR DETAILS NAME : M.GIREESHWAR CLASS : IX THEME : OZONE LAYER INSTITUTION : JAWAHAR NAVODAYA VIDYALAYA, LEPAKSHI, ANANTAPUR (dist.) ANDHRA PRADESH 2
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- 4. • Our green Earth is protecting us like a tree. • Though Earth is giving everything, man was making it to be destroyed. • One of the big destruction making by man was destroying the ozone layer. 4
- 5. • On the earth, there are many atmospheric layers which protect us always. • Species are living in Troposphere with sufficient Oxygen (O2). • Stratosphere is fully covered with Ozone gas(O3). • Stratosphere is spread over 50kms in height and associated with weather. 5
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- 7. • OZONE = (O3) (in chemistry) • Ozone is basically formed in the Earths atmosphere (Stratosphere) • Ozone is a mixture of small fraction of N2 and O2 gases. • At near ground level, ozone is an air pollutant. Even at low concentration, it is irritating to the respiratory system. 7
- 8. • If ozone gas is on stratosphere, man will be protected from harmful Ultra violet rays. • Ozone protects us from many skin cancer and many harmful diseases. • It also protects plants and marine life. • Ozone is much more reactive than O2. • It occurs naturally in small amounts in the Earth's upper atmosphere. 8
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- 10. •Ozone is formed from atmospheric oxygen in the presence of sunlight. Ozone layer protects the earth’s surface from an excessive concentration of UV radiations. •Experiments have shown that Nitrogen Oxide combines very rapidly with Ozone Gas and there is, thus, the possibility that Nitrogen Oxides emitted from the exhaust systems of supersonic jet aeroplanes might be slowly depleting the concentration of the Ozone layer in the upper atmosphere. 10
- 11. Ozone layer started to become thinner in the width and made holes which are known as ozone holes. Ozone holes are caused by ODS (Ozone depleting substances). 11
- 12. ODS are chemicals that potentially deplete the ozone layer. ODS contain chlorine and bromine atoms. ODS are released from refrigerators, pesticides, jets, rockets, etc. E.g. For ODS are chlorofluorocarbons (CFCs), carbon tetrachloride. 12
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- 15. • When the ozone layer gets holes, they can’t stop Uvradiations and infra-red rays from sun. • This results in falling of UV rays directly on human which inturn results in damage of human DNA, skin cancer and eye cataracts. • Many trees and aquatic life will be destroyed. 15
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- 17. • For protecting us and our green earth, we have to reduce the usage of ODS, CFCs, etc. The following steps are to be taken. 1) We have to plant trees. 2) Burning of plastic should be banned. 17
- 18. 1) We should ban/reduce the usage of Montreal protocol. 2) We have to use non-polluting vehicles. 3) We have to use eco-friendly house hold cleaning products. 4) We have to avoid usage of pesticides. 5) We have to ban the usage of green house gases like methane, CO2, nitrous oxide. 18
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- 21. • Ozone plays a key role in the temperature structure of the earth’s atmosphere. • Many experimental studies of plants and animals and clinical studies of humans have shown the harmful effects of excessive exposure to UV-B radiation. • Ozone reacts strongly with other molecules. • Chlorofluorocarbons are released from spray cans, refrigerants, electronic cleaning agents and foam. • CFCs had hailed as the “wonder chemicals”. 21