MUHAMMAD FAHAD ANSARI 12IEEM 14

1. Ozone Depletion
MUHAMMAD FAHAD ANSARI
12IEEM 14

2. Ozone Depletion
What can be done to prevent
depletion of the ozone?

3. Ozone
 Ozone is comprised of 3 oxygen
molecules, known as O3.
 When we hear the term Oxygen, it is
usually referring to the Oxygen that we
breathe, known as O2.
 O2 is a necessary component for life
(almost all life ) on Earth's surface. It is
the form of Oxygen that we breathe.
 It is used in respiration in animals and
photosynthesis in plants.

4.  Ozone, or O3, is in fact
toxic to living creatures,
but without it we would
be in a lot of danger.
 Ozone is naturally found
in the upper level of our
atmosphere. i.e.
stratosphere
 It absorbs many of the
harmful rays of the sun,
known as Ultraviolet
radiation (UV-A, UV-B
and UV-C) which can
cause cancer and cellular
damage.

5. Causes
 Pollution is a major source of
depletion of the Ozone layer.
 Many Man-made pollutants contain
compounds called
Chlorofluorocarbons (CFCs) and
bromofluorocarbons.
 These compounds can rise to the
upper level of our stratosphere
 Where UV light breaks them into free
radicals of Chlorine (Cl) and Bromine
(Br).
 Each of these radicals is then free to
react with O3 and catalyze a chain
reaction capable of breaking down
over 100,000 ozone molecules.

6. Health Effects
 As the ozone layer diminishes, Australia's natural sun
block begins to fade.
 This is a problem because Ultraviolet radiation mainly
affects our skin and eyes. Even though we can't feel it,
the higher the dose, the greater likelihood of damage.
 The most serious effect of sunlight on the skin is the
generation of cancer.
 Most skin cancers are found in people over 40 years
old.
 Australia has the highest incidence of skin cancer in the
world.
 With only 3% of the worlds population, they manage to
report for 6 % of all dangerous forms of skin cancer
diagnosed globally.
 About 1200 people die each year in Australia as a
result of skin cancer.

7. Greenhouse gases
 Gases that are part of the
greenhouse gas layer in
the atmosphere.
 These gases form a
practically invisible
bubble around Earth that
reflect some forms of
waves.
 The more common gases
include carbon dioxide,
methane, and nitrogen
oxides.
 These gases in the
atmosphere create a
greenhouse effect on
Earth

8.  They allow the
sun's ray to go
into Earth but
upon escaping
they are reflected
back to Earth
again.
 It's like sitting in a
greenhouse
without any
windows or doors
throughout
summer,
eventually you get
hot.