This document discusses the ozone layer and its thinning due to chlorofluorocarbons (CFCs). It begins with an introduction to the ozone layer, noting that it is a region in the stratosphere that contains high concentrations of ozone molecules that absorb ultraviolet radiation. It then explains that the thinning of the ozone layer is mainly due to CFCs, which are broken down by ultraviolet rays to produce chlorine radicals that break down ozone molecules. As a result, thinning of the ozone layer leads to excessive ultraviolet radiation reaching the Earth's surface, increasing risks like skin cancer and damage to crops and nutrients.

1. SMK KULAI BESAR
SCIENCE FORM 1
NAME : THULSIRAM A/L KUMARASWARAN
CLASS : 1 RK 2
TEACHER’S NAME : TEACHER NUR HIDAYU BINTI MOHD NAIM

3. INTRODUCTION OF THE
OZONE LAYER
INTRODUCTION
OF THE OZONE
LAYER
THE OZONE LAYER IS
A REGION IN THE
STRATOSPHERE,
BETWEEN SEVENTEEN
AND TWENTY-FIVE
KILOMETRE ABOVE
THE EARTH ‘S
SURFACE
THE OZONE LAYER
CONTAINS HIGH
CONCENTRATION OF
OZONE MOLECULES ,
O3 THAT ABSORB
ULTRAVIOLET
RADIATION AND SHIELD
ORGANISMS FROM ITS
DAMAGING EFFECTS

4. THINNING OF THE OZONE
LAYER
THINNING
OF THE
OZONE
LAYER
THE THINNING
OF THE OZONE
LAYER IS
MAINLY DUE TO
CHLOROFLURO
CARBONS (CFC).
ONCE IN THE
STARTOSPHERE,
CFC ARE
BROKEN DOWN
BY
ULTRAVIOLET
RAYS.
THESE CHLORINE
RADICALS BRAKE
DOWN OZONE
MOLECLUES , O3
IN A CHAIN
REACTION.
AS A RESULT ,
THE HIGHLY
REACTIVE
CHLORINE
RADICALS ( CI )
ARE RELEASE.

5. THE EFFECTS OF OZONE
DEPLETION
THE
EFFECTS
OF OZONE
DEPLETION
EXCESSIVE
ENTERING OF
ULTRAVIOLET
RADIATION TO
THE EARTH ‘S
SURFACE
LEAD TO HIGHER
RISK OF SKIN
CANCER ,
CATARACTS AND
SUNBURNS DUE TO
PROLONGED
EXPOSURE TO
ULTRAVIOLET
RADIATION
REDUCE THE
NUTRIENT
CONTENT AND
CROP YIELDS DUE
TO ULTRAVIOLET
RADIATION
LEAD TO THE
INCREASE OF THE
EARTH ‘S
TEMPERATURE

6. THE PICTURES OF THE OZONE
LAYER

7. UV protection by the Ozone Layer

8. Layers of the Atmosphere

9. The Ozone Layer
MAN-MADE POLLUTATS BURN AHOLE IN THE AZONE LAYER
CFC and HCFC
Aerosols,refrigerants,air-
conditioning
Halons
Agriculturul pesticidesMethly bromide
Extinguishers

10. THE THINNING OF THE OZONE LAYER
HAVE SOMETHING IN COMMON WITH
GREENHOUSE EFFECTS

11. The picture in the above slide is about iceberg
which is a very huge ice that contain most of the
sea water.If there is a hole in the ozone layer
than the iceberg will melt and will cause this:

12. WORDS HARD TO
UNDERSTAND
OZONE HOLE
• A term invented to discribe a region of a very low
ozone concentration above the antartic that
appears and disappears with each austral
(southern hemisphere) summer.
CLOROFLUOROCARBON (CFC)
• A family of compounds consisting of
carbon,fluorine and chlorine.

13. ULTRAVIOLET RADIATION
• A FORM OF ELECTROMAGNETIC RADIATION WITH
WAVELENGTHS JUST LESS THAN THOSE OF
VISIBLE LIGHT ( FOUR TO FOUR HUNDRED
NANOMETERS , OR BILLIONTHS OF A METER )
RADIATION
• ENERGY TRANSMITTED IN THE FORM OF
ELECTROMAGNETIC WAVES OR SUBATOMIC
PARTICLES

16. QUESTIONS & ANSWERS
1.What is the meaning of ozone hole?
A term invented to discribe a region of a very low ozone concentration above the
antartic that appears and disappears with each austral (southern hemisphere)
summer.
2.What is the meaning of clorofluorocarbon?
A family of compounds consisting of carbon,fluorine and chlorine.
3.What is the meaning of ultraviolet radiation?
A form of electromacnetic radiation with wavelengths just less than those of visible
light ( FOUR TO FOUR HUNDRED NANOMETERS , OR BILLIONTHS OF A METER )
4.What is the meaning of radiation?
Enegy transmitted in the form of electromacnetic waves or subatomic particles.

18. THANK YOU
FROM ,
Thulsiram