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Criado por katiehumphrey
mais de 10 anos atrás
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natural hazard
natural disaster
earth
continental crust
plates move because mantle underneath moves with convection currents
where plates meet are called boundaries/plate margins
destructive plate boundary
no crust is destroyed
creates volcanoes
A constructive plate boundary, sometimes called a divergent plate margin, occurs when plates move apart. Volcanoes are formed as magma wells up to fill the gap, and eventually new crust is formed.
collision zone
A conservative plate boundary, sometimes called a transform plate margin, occurs where plates slide past each other in opposite directions, or in the same direction but at different speeds.
Friction is eventually overcome and the plates slip past in a sudden movement. The shockwaves created produce an earthquake.
types of plate boundary
destructive margins cause earthquakes
constructive margins cause earthquakes
conservative margins cause earthquakes
destructive margins cause volcanoes
constructive margins cause volcanoes
constructive margins cause volcanoes
earthquakes
volcanoes
focus
epicentre
seismometer
shockwave
richter scale
magnitude
magma chamber
lava
crater
vent
secondary cones
ash, steam and gas
volcanic bombs
composite volcanoes
shield volcanoes
primary impacts of earthquakes
secondary impacts of earthquakes
impacts of earthquakes are more severe in LEDCs
people live in earthquake prone areas
reduce impacts of earthquakes
earthquake in MEDC:
Italy 6th April 2009
6.3 on richter scale
destructive margin
damage $15 billion
earthquake in LEDC:
Pakistan 8th October 2005
7.6 on richter scale
destructive margin
damage $5 billion
lots of people live close to volcanoes
primary impacts of volcanoes
secondary impacts of volcanoes
reducing impacts of volcanoes