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Year 9 NSW
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Science
Topic : Australia's ecosystems
In this topic you will learn...
Chapter 1 :
Bushfire
Australia is an arid continent that has unique ecosystems and organisms.
Bushfire, drought and flood are events that affect Australia`s ecosystems.
Fire has always been a part of the natural cycle of ecosystems in Australia.
Indigenous peoples changed the natural pattern and timing of fires.
Indigenous peoples used fire to burn areas of bush for a number of reasons.
Native plants and animals have developed specialised ways to survive a fire.
Bushfires in Australia have both negative and positive effects on ecosystems.
Chapter 2 :
Drought
Drought is part of the Australian environment.
A drought occurs when there is a prolonged, abnormally dry period.
Droughts occur regularly in Australia and are caused by climate change.
Australia is prone to drought because of its geography.
The El Niņo phenomenon is climate change that causes droughts in Australia.
Some droughts in Australia are long-lived while others are short and intense.
Droughts affect agricultural and natural ecosystems, causing major damage.
The impact of a drought may be felt for many years.
Chapter 3 :
Flood
Floods cause damage to Australia`s ecosystems.
Most areas of Australia experience occasional flooding.
Floods cause loss of lives and damage to property.
La Niņa is associated with the increased likelihood of wetter conditions.
In northern Australia, floods are usually caused by tropical cyclones.
Floods provide positive ecological effects to the natural ecosystems.
Some ecosystems need floodwater to grow.
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This topic includes
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4 videos
1 final exam
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