World at Risk

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  • Created by: Maddy.892
  • Created on: 21-04-14 15:56
Context Hazard
Widespread or global threat due to environmental factors E.gClimate change
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Geophysical Hazard
A hazard formed by tectonic/geological processes E.g earthquakes, volcanoes and tsunamis
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Hazard
A perceived natural event that has the POTENTIAL to threaten both life and property
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Hydro-meteorological Hazard
A hazard formed by hydrological (floods) and atmospheric(storms and droughts) processes
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Vulnerability
A high risk combined with an inability of individuals and communities to cope
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Disaster
A hazard becoming reality in an event that causes deaths and damage to goods/property and the environment
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Risk
The probability of a hazard event occurring and creating a loss of life and livihoods
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Albedo
How much solar radiation a surface reflects
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Enhanced Greenhouse effect
Occurs when the levels of greenhouse gases increase in the atmosphere due to human activity
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Fossil Fuels
Energy sources that are rich in carbon and release carbon dioxide when burnt E.g Coal
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Global Warming
A recently measured rise in the average surface temp of the planet
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Greenhouse Effect
The warming of the Earth's atmosphere due to the trapping of heat that would otherwise be radiated back into space. It enables the survival of life on earth
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Feedback Mechanism
Where the output of a system acts to amplify (positive) or reduce (negative) further output. Eg melting of Arctic permafrost leads to the release of trapped methane which leads to further global warming
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Frequency
How often an event of a certain size (magnitude) occurs
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Magnitude
The size of an event Eg the size of an earthquake on the richter scale
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Asthenoshphere
A semi-molten zone of rock underlying the Earth's crust
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Conservative Boundary
A boundary between plates where the movement of the plates is parallel to the plate margin and the plates slide past each other
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Constructive Boundary
Boundary between the plates where the plates are diverging (moving apart)
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Destructive Boundary
Boundary where the plates are converging (moving together)
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Lithosphere
The crust of the earth 80-90km thick
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Magma
Molten material that rises towards the earths surface when hotspots in the asthenosphere generate convection currents
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Natural Hazard
A natural event or process which affects people Eg causing loss of life or injury, economic damage, disruption to people's lives or environmental degradation
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Plates
Rigid, less dense 'slabs' of rock floating on the asthenosphere
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Hotspots
A localised area of the earths crust with an unusually high temp
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Plume
An up-welling of abnormally hot rock within the Earth's mantle
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Inter-tropical convergence zone
Zone of low atmospheric pressure near the equator. This migrates seasonally
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Other cards in this set

Card 2

Front

A hazard formed by tectonic/geological processes E.g earthquakes, volcanoes and tsunamis

Back

Geophysical Hazard

Card 3

Front

A perceived natural event that has the POTENTIAL to threaten both life and property

Back

Preview of the back of card 3

Card 4

Front

A hazard formed by hydrological (floods) and atmospheric(storms and droughts) processes

Back

Preview of the back of card 4

Card 5

Front

A high risk combined with an inability of individuals and communities to cope

Back

Preview of the back of card 5
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