natural hazard correct answers Any natural process that is a potential threat to human life and property
natural disaster correct answers great destruction or loss of life caused by natural forces rather than by human actions
Catastrophe correct answers an event resulting in great loss and mi...
Meteorology || very Flawless.
natural hazard correct answers Any natural process that is a potential threat to human life and
property
natural disaster correct answers great destruction or loss of life caused by natural forces rather
than by human actions
Catastrophe correct answers an event resulting in great loss and misfortune
Most common hazard related deaths correct answers Heat
Reoccurrence Interval correct answers Probability that a natural event of a certain magnitude will
happen within a very period of time
past records/geology/climate>prediction
an average quantity: time
Reoccurrence Interval Equation correct answers RI = (n+1)/(m) where n= number of years of
data
and m = number of years with flood
average frequency correct answers Frequency is the inverse of reoccurrence interval: 1/time
Magnitude of an event correct answers Inversely porportionate to its frequency: 1/f
fractal correct answers an irregular shape that looks much the same at any scale on which it is
examined
feedback effect correct answers Where a small disturbance in a system leads to effects that
increase that disturbance (positive feedback) or decrease it (negative feedback)
global warming > less ice> sun not reflected> colder
Precursors correct answers natural events that precede disasters
Mitigation correct answers lessening of something that causes suffering
good land planning
Oppositions to mitigation correct answers -hazardous areas heavily populated
- regulations ignite legal and political opposition
- restrictions viewed as violation of rights
risk correct answers Hazard considered in light of reoccurrence interval and expected cost
measured in dollars
Risk equation correct answers R= probability of loss x cost $
, Earth radius correct answers 6400 km
Highest point on earth correct answers Mt. Everest 8850m
Deepest point in the ocean correct answers Marianas Trench 11000m
Earth circumference 2r correct answers 40000 km
Width of US correct answers 4000 km
Layers of earth by rock composition correct answers Core mantle crust
Lithosphere correct answers A rigid layer made up of the uppermost part of the mantle and the
crust.
Asthenosphere correct answers The soft layer of the mantle on which the lithosphere floats.
continental crust correct answers Silica rich, low density 2.7g/cm3, 30/50 km thick
oceanic crust correct answers Iron magnesium rich, higher density 3gcm3 7km thick
Mantle density correct answers 3.3 g/cm3
Monorvicic discontinuity correct answers Boundary between earth crust and mantles
low velocity zone correct answers the asthenosphere underlying oceanic lithosphere in which
seismic waves travel more slowly, probably because rock has partially melted
Isotasy correct answers Proportion of mass immersed in liquid equals the density of the floating
solid divided by the density of the liquid
think oceanic crust as an ice cube and continental as a cork
floating Objects displace the same amount of liquid as their mass
lithospheric plates correct answers large pieces of Earth's lithosphere that move over the
asthenosphere
aprox 8cm a year
plate tectonics correct answers A theory stating that the earth's surface is broken into plates that
move.
divergent boundary correct answers A plate boundary where two plates move away from each
other.
convergent boundaries correct answers Places where tectonic plates are coming together
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