CHEMISTRY

9th

MRS.EKTA SHUKLA

HERITAGE INTERNATIONAL PUBLIC

SCHOOL

Session – 2020-2021

PRESENTATION

ON

‘‘DEPLETON OF OZONE LAYER

IN

ANTARCTICA’’

GUIDED BY – MRS EKTA SHUKLA

PRESENTED BY – ALIKA PHILLIP, ANJAIL SHUKLA,

AYUSHI KUMARI, AMBIKA TIWARI

CERTIFICATE

This is to certify that ‘‘ Alika Phillip , Anjail Shukla , Ayushi Kumari , Ambika Tiwari ’’ students of class 9^th have successfully completed their project on

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‘‘ DEPLETION OF OZONE LAYER IN ANTARCTICA’’

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Under the guidance of ‘‘ Mrs Ekta Shukla ’’ during the academic year 2020-2021.

Internal Signature

External Signature

Principal’s Signature

ACKNOWLEDEMENT

We would like to express our special thanks and gratitude to our Chemistry teacher “ Mrs.Ekta Shukla ’’for her able guidance and support in completing our project.

We would like to extend our gratitude to the Principal Ma’am “ Mrs . Manpreet Fulmail ’’ for providing us with facilities that were required.

DATE:

1-10-2020

Anjail Shukla , Alika Phillip , Ayushi Kumari , Ambika Tiwari

Class – 9th

INDEX

• OZONE LAYER

• OZONE LAYER DEPLETION

• CAUSES OF OZONE LAYER DEPLETION

• EFFECTS OF OZONE LAYER DEPLETION

• IMPORTANCE OF OZONE LAYER

• THE PROCESS OF OZONE LAYER DEPLETION

• PROTECTING OZONE LAYER

• ANTARCTICA

• ANTARCTIC OZONE HOLE

ANTARCTICA

• Antarctica is the southern most continent in the world and the site of south pole, is a virtually unhabited, ice-covered landmass.

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• Antarctica is bigger than Europe and almost twice the size of Australia.

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• It is the world’s highest ,driest ,windiest ,coldest ,and icest continent. It’s thick ice cover 98 percent of the landmass.

ANTARCTIC OZONE HOLE

• The Antarctic Ozone Hole is an annual springtime event above earth’s frozen, southernmost continent. Conditions above Antarctica magnify the destructive potential of a changing atmosphere.

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• Naturally occurring Polar Stratospheric Clouds, man-made CFCs, and the return of sunlight set off destructive chain reaction that decimates huge portions of he ozone layer, a critical protection of life on Earth.

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• In 1987, twenty seven nations signed the Montreal Protocol to reduce substances that deplete the ozone layer.

OZONE LAYER

• It is a thin layer of layer of O3 particles present in the stratosphere .

• It absorbs harmful UV-B rays and prevent them from entering the earth’s atmosphere.

• It have an altitude of about 10 to 50 kms.

OZONE LAYER DEPLETION

• Ozone layer depletion is simply the reduction of the amount of ozone in stratosphere.

• It is caused by the excessive release of concentrated chlorine and bromine from man made compounds such as chlorofluorocarbons (CFFs).

CAUSES OF OZONE LAYER DEPLETION

• The main cause for the depletion of the ozone is determined as the excessive release of chlorine and bromine from man-made compound such as chlorofluorocarbons(CFFs).

• Other ozone-depletion substances (ODS) include hydro chlorofluorocarbons and volatile organic substances (VOSs).

THE PROCESS OF OZONE DEPLETION

• Ozone Depletion Substances, in the stratosphere, are exposed to UV radiation and thus, they break down to release a free chlorine atom.

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• This free chlorine atom reacts with an ozone particle (O3) , and forms chlorine monoxide(ClO) and a molecule of oxygen.

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• Cl + O3 ClO + O2

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• Now, ClO react with an ozone molecule to form a chlorine atom, and two molecules of oxygen.

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• ClO3 + O Cl + 2O2

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• The free chlorine molecule again reacts with ozone to form chlorine monoxide .

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• The process continues, and this results in the depletion of ozone layer .

EFFECTS OF OZONE LAYER DEPLETION

ON NATURE

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• Crop damage

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• Urban pollutions

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• A large hole is formed over Antarctica in the ozone layer which shows its continuous depletion.

ON HUMANS

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• Eyes Defects and Cataract

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• Weakened Immune System

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• Skin Cancer

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• Malnutrition

IMPORTANCE OF OZONE LAYER

The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects .

PROTECTING OZONE LAYER

• Always use certified refrigerants in car ACs . Repair all the leaks, if any, in AC system .

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• Stop using aerosol sprays/cans.

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• Always purchase ACs and refrigerators with non – ozone depleting refrigerant .

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• Use/buy more recycled products .

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• Always prefer to carpool or use public transport .

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• Desist from using pesticides .

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• Prohibit the use of harmful nitrous oxide .

CONCLUSION

This depletion will get controlled if we control ourselves to use things which are not harmful to nature.

SAVE NATURE

MAKE FUTURE

Biblography

.www.slideshare.com

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.www.wikipedia.com

.www.scientificamerican.com

THANK YOU