destruction of the ozone layer.

1. By Israel Ramírez Parrales -EA-3,4
Destruction of the Ozone Layer
The ozone layer is a layer in Earth’s atmosphere which contains
relatively high concentrations of ozone (O3). This layer absorbs 93-
99% of the sun's high frequency ultravioletlight, which is potentially
damaging to life on earth.

2. By Israel Ramírez Parrales -EA-3,4
Problem Description
Despite Ozone Layer is vitally important to life because it absorbs
biologically harmful ultraviolet (UV) radiation emitted from the Sun,
but it is being destroyed, forming a big hole in it that is commonly
referred to as the ozone hole. It is particularly created over
Antarctica where exists a special condition that accelerates the
depletion of the ozone layer.

3. By Israel Ramírez Parrales -EA-3,4
Causes
Chlorofluorocarbons (CFCs) contain fluorine, carbon and chlorine atoms.
Besides this, they are considered to be the main cause of Ozone depletion.
CFCs are widely used as coolants in refrigeration and air conditioners, as
solvents in cleaners, particularly for electronic circuit boards, as a blowing
agents in the production of foam (for example fire extinguishers), and as
propellants in aerosols.
A chlorine atom reacts with an ozone molecule, taking an oxygen atom with
it (forming ClO) and leaving a normal oxygen molecule. The chlorine
monoxide (i.e., the ClO) can react with a second molecule of ozone (i.e.,
O3) to yield another chlorine atom and two molecules of oxygen.

4. By Israel Ramírez Parrales -EA-3,4
Effects
 An increase in the incidence of skin cancer.
 A large increase in cataracts and Sun burning.
 Suppression of immune systems in organisms.
 Adverse impact on crops and animals.
 Reduction in the growth of plankton found in the Earth's oceans.
 Cooling of the Earth's stratosphere and
 Global Warming.

5. By Israel Ramírez Parrales -EA-3,4
Posible Solutions
Reduce the use of large amounts of CFCs is helpful. Moreover, the
only long term solution to solve the problem of depletion of the
ozone layer is to phase out the use of CFCs.

6. By Israel Ramírez Parrales -EA-3,4
Conclusions
 We must be aware of the effects that ozone depletion can cause.
 Eventhough there are some protocols in order to reduce CFC use,
we should use them conciously, so that we can have good healt for
a long time and maybe let the ozone layer rebuild by itself.
 We could use sunscreen to protect our skin from dangerous UV
rays.

7. By Israel Ramírez Parrales -EA-3,4
References
 http://www.epcc.pref.osaka.jp/apec/eng/earth/ozone_layer_depletio
n/susumu.html
 http://en.wikipedia.org/wiki/Ozone_layer
 http://www.epcc.pref.osaka.jp/apec/eng/earth/ozone_layer_depletio
n/susumu.html
 http://www.ace.mmu.ac.uk/eae/ozone_depletion/older/CFCs.html
 http://en.wikipedia.org/wiki/Ozone_depletion
 http://en.wikipedia.org/wiki/Catalytic
 http://www.umich.edu/~gs265/society/ozone.htm
 http://www.ausetute.com.au/cfcozone.html