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Geography

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Unit 1

World at Risk

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Hazards
Natural hazard- natural event or process which affects
people( causing loss of life or injury, economic damage, etc.)


Hydro Meteorological: Geophysical:
-caused by running water and its -caused by earth processes
processes(hydro) and those associated with A. internal earth processes of tectonic origin
or caused by weather patterns. ·…

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The risks are getting worse in some countries because:
1. the frequency is increasing with climate change.
2. Vulnerability is increasing as a result of unsustainable development
leading to poor land use and environmental degradation.
3. The capacity to cope is decreasing owing to poverty and
urbanisation.
Risk are lower…

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The number of people reporting natural disasters has risen sharply
since the 1960's
There has been a
significant rise in
Hydro-
meteorological
disasters, rises in
floods storms and
even droughts
Geophysical
disasters ­ we
have seen a slight
increase in
disasters
reported, this could be because more people are living…

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Reasons for this trends:
Land Pressure
Technological innovation
Poverty
Economic growth
Economic development
Rapid urbanisation and growth of mega-cities
Political change
Population growth and change




However, the deaths are falling
Before a disaster ­ There is better mitigation (use of hazard proof/
climate proof structures) and improved disaster preparedness using…

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Most common hazards
Floods
Windstorms(hurricanes)


Worst impacts
earthquakes
floods
windstorms


Why are floods and windstorms increasing?
increased warming causes warm air to rise, creating convection cells-
which form hurricanes
increasing tempereatures increase evaporation, which in turn leads to
increasing rainfall- and therefore greater flooding

Boxing day tsunami 2004
Caused by…

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Bushfires

Most frequent causes:
carelessness
lighting strikes


How fire spreads:
Ground fires
dry leaf litter and things catch light and fire spreads through the
undergrowth
Crown fires
where fires spread through the tree tops
Spot fires
caused by burning embers landing away from the main fire and
starting new fires…

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