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the challenge of natural hazards test - Coggle Diagram
the challenge of natural hazards test
natural hazard
an event that has the potential to harm a vulnerable popullation
examples
atmospheric hazard
hurricane
tornado
fog
drought
lightening
terrestrial/geological hazard
volcanic eruption
earthquake
landslide
mudflow
tsunami
water based hazards
riverflood
stormsurge
waterspout
coastal flood
avalanche
biological hazards
virus
poisonous plant
parasites
vernomous insects
bacteria
factors affecting the hazard risk
natural factors
rock type
magnitude
how big a event is
frequency
how often (more often the more prepared people usually are)
population density and distribution
number or people and where they are
level of development of the place
PREPARE, RESPOND, these are most likely better in HICs than LICs or NEE
governments
technology
planning laws
agencies
plates
structure of the Earth
Mantle, 1000-3700 degrees C
Outer Core, 4400 degrees C
Crust
Inner Core, 6000 degrees C
types of plates
Continental Crust (land)
20-200km thick
less dense
mostly granite rock
is not destroyed (renewed(creating land))
up to 3.8 billion years old
Oceanic Crust (ocean)
destroyed
dense
5-10km thin
basaltic rock
less than 200 million years old usually (young)
plate tectonics theory
slab pull
at destructive margins the denser oceanic crust sinks bac into the mantle, pulling the plate behind it along (like a chain falling off a desk)
ridge push
as plates move apart at a constructive plate margin magma rises and cools, forming new crust. The new crust pushes the old crust either side of it away
read notes for types of plate margins
conservative
collision
destructive
constructive
earthquake key terms
earthquake
epicentre
fault
aftershock
focus
magnitude
richter scale
seismic waves
seismometer