OZONE LAYER

o Ozone layer is made up from ozone molecule.

o An ozone molecules is made up of three oxygen atom bound together.

o Its located 19-48km above the Earth’s surface.

o The function – serves as a shield from the Sun’s harmful energy and absorb the ultraviolet (UV) radiation that enters the atmosphere.

o Now a days….human activities had destroy the ozone layer.

HOW THE OZONE LAYER HAD BEEN DESTROY??

• The ozone layer had been destroy by the chemical substance – CFCs (chlorofluorocarbon)

• CFCs was uses in many household item (aerosol), and electrical item (refrigerator and air-conditioner).

• Than the CFCs was released to the atmosphere and mix with the normal atmospheric gases at reach the stratosphere.

• CFCs will react with the ultraviolet light and released chlorine atoms.• This chlorine atoms will damage the ozone layer. One chlorine atom can destroy

100 000 ozone molecules.

CFC

CFCCFC

Ultraviolet light

Chlorine atoms

Chlorine atoms will destroy the ozone layer

CFCs react with ultraviolet light,Released the chlorine atoms

Ozone layer- been destroy by human activities

A THINNER OZONE LAYER LEAD TO INCREASED ULTRAVIOLET RADIATION AT THE EARTH’S SURFACE….what will happen next???

Mutation Skin cancer Eye’s cataract Low immunity Impair tree growth Kill the phytoplankton

EFFECTS OF OZONE DEPLETION

EYE’SCATARACT

PHYTOPLANKTON

The general retreat of mountain glaciers during the past century is one example of evidence that the climate is changing.

1928South Cascade Glacier, Washington

1979South Cascade Glacier, Washington

2003South Cascade Glacier, Washington