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Forest fires
Human activity produces waste such as broken
glass and cigarettes, and barbecues can cause
fires that destroy large areas of forest. After a
fire, rain washes away the soil. Together, these
changes can cause the extinction of many plant
and animal species.
Deforestation
Many forests are being cut down by the wood
and paper industries or by farmers to make
larger farms. This can result in the destruction of
the natural forest ecosystem. When the habitats
of many animals in the forest ecosystem are
destroyed, many species can become extinct.
2
Complete the sentences in your notebook.
a)
Human activity causes...
b)
... and ... are changes which affect
marine ecosystems.
3
Make a poster. Show how to protect natural ecosystems. Use the tables to write sentences.
Help reduce
pollution.
overfishing.
deforestation.
Don’t
waste paper!
use your car!
eat young fish!
4
T
h
i
n
k
!
What human activities affect an ecosystem in your area? Write sentences.
affects
Pollution
Overfishing
Deforestation
in my area. This causes...
the plants
the animals
organisms
5
36
QUIZ
Check your learning.
A
C T I V I T I E S
c)
... and ... are changes which affect forest
ecosystems.
d)
The chaparral ecosystem is an example of...
