Natural Hazards

Subdecks (2)

Natural hazard 
A natural process which could death, injury or disruption to humans, or destroy property and possessions
Natural disaster 
An event that has actually happened
Types of natural hazards
Geological hazards
Meteorological hazards
Geological hazards 
Caused by land and tectonic processes
Examples include volcanoes, earthquakes and landslides
Meteorological hazards 
Caused by weather and climate
Examples are tropical storms and flooding caused by extreme weather
Hazard risk 
The probability that a natural hazard occurs
Factors affecting hazard risk
Type
Frequency
Magnitude
Tectonic plates 
The Earth's surface is separated into tectonic plates
How tectonic plates move
1. Convection currents in the mantle
2. Plates move apart where currents diverge
3. Plates move towards each other where currents converge
Main plate boundaries 
Destructive
Conservative
Constructive
Collision
Destructive plate boundary 
Heavier oceanic plate subducted into mantle, causing volcanoes and earthquakes
Conservative plate boundary 
Plates move sideways past each other, causing earthquakes
Constructive plate boundary 
Plates move apart, magma rises to fill gap and form new crust
Collision plate boundary 
Continental plates pushed upwards, forming fold mountains, also causes earthquakes