Natural hazards Flashcards
Natural hazard
a natural event that threatens people, or has the potential to cause damage destruction and death
types of natural hazard
tectonic hazards
weather hazards
Factors affecting hazard risk
nature of the hazard
vulnerability
capacity to cope
Slab pull
the process of older, denser sections of crust subducting into the mantle and pulling sections of new, light crust with it.
ridge push
lava erupts to create crust as plates move apart. As it cools, it pushes down the slope of the top ridge, pushing the plates even further apart
3 types of plate boundary
constructive
conservative
destructive
destructive plate definition
plates move together
constructive plates definition
two plates move away
Conservative plates definition
two tectonic plates slide past each other.
process of destructive plate boundary
- Convection currents and slab pull move plates together
- Oceanic plate subducts
- Melting of the plate
- Magma rises
- Volcanic eruption of ash and lava.
process of a constructive plate boundary
- Convection currents and ridge push move plates apart.
- Magma rises
- Volcanic eruption of ash and lava
- A ridge is formed as new crust is created.
process of a conservative plate boundary
- Convection currents move plates side by side
- Plates lock together and pressure builds
- Pressure is suddenly released in an earthquake with seismic waves released from the focus.