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3454765
Natural Hazards
Description
Brief summary of A Level Natural hazards
No tags specified
geography
natural
hazards
10 geo
higher school certificate(hsc )
Mind Map by
ellen s
, updated more than 1 year ago
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Created by
jacobhatcher97
about 9 years ago
Copied by
LorettaRose
about 9 years ago
Copied by
ellen s
about 9 years ago
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Resource summary
Natural Hazards
El Nino and La Nina
El Nino
Australia: hot dry conditions: Drought
La Nina
Warm water pushed towards the Australian coast
High pressure over South America bringing rainfall to Australia
Australia: greater then usual rainfall
Drought
Definition: An extended period of below average precipitation that causes water shortages
4 MAIN CAUSES OF DROUGHT:-
1. High pressure know as anti-cyclones block low pressure from moving in bringing weather fronts with them
2. Warm oceans cause moist air to rise forming clouds over the ocean. If winds are too weak to blow clouds onto land then no rainfall occurs over land
3. Weather front may not bring rain in example with southern Europe once the front has gone over the UK
4. If oceans are colder then less moist air will rise, thus less clouds from which would subsequently bring rain
Flooding
Human factors:-
Deforestation means steep slopes have low infiltration rates thus water flows straight into rivers
Clearing forest area for agriculture makes it more likely for flood waters to cause damage
Bushfire
Fuel,
El Nino:: hot, dry weather can make dangerous conditions
Heat
oxygen
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