CHAPTER9;

ENDANGER

ED

ECOSYSTE

M

TH E TH I N

N I NG O

F TH E O

ZON E LAY E R A

ND

TH E I M

PAC T OF G

LOB A L WARM I N

G

OZONE

LAYER

A gas that contains three oxygen atom; O³

Located at the atmospheric layer;

stratosphere which is 20-50 km away from the

Earth`s surface

Acts as an absorbance to the harmful ultraviolet

rays; UV rays and prevents them from reaching the Earth`s

surface

THE THINNING OF THE OZONE LAYER

Today, the ozone layer is becoming thinner because of the destruction of

the ozone gas

It was found that the depletion of the ozone layer occurred over both Artic and Antarctica; creating ozone holes

The ozone hole in the Antarctica is found to be as big as the continent of

USA

The depletion of ozone is caused by the increasing use of

chlorofluorocarbons; can break down and destroy ozone molecules

The thinning of the ozone layer has been recorded since the 1970s

Ultraviolet radiation has since risen by 7% in a decade in the northern hemisphere and in the southern hemisphere, the increase is 10%

In 1985,it was reported that the stratospheric ozone concentrations over the Antarctica had declined by

40% since 1977

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IMPACT OF THE THINNING OF THE OZONE LAYER AND GLOBAL WARMING ON THE

ECOSYSYTEMThe thinning of the ozone layer allows ultraviolet radiation to reach the

Earth`s surface and destroy the planktons in the food

chain. This upset s the balance in the ecosystem

and consequently threatens the other ecosystems in the

water

Ultraviolet radiation also reduces the number of

stomata and amount of chlorophyll in the leaves.

Green plants which are the producers in a food chain

cannot carry out photosynthesis efficiently. The plants will die and the biotic

components in the ecosystem are threatenedGlobal warming causes the atmosphere to

be very hot; resulting in drought and changes in the climate . This affects the

biotic components in the ecosystem which consequently affects the distribution and population of the biotic components. As a result, the balance of various ecosystems

on Earth in not equilibrium

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YOU☁ IKA DYANA

☁ NUR SYAUQINA ADIBAH☁ TOH LI TING