Natural Hazards Flashcards
What is the order of cells in the global circulation system?
Polar Ferrel Hadley Ferrel Polar
Why is there more rain in the RF?
Hot air rises
Low pressure
Rain
What 3 ways may climate change affect tropical storms?
Intensity
Increased rainfall
Distribution
How does increased rainfall effect a tropical storm?
Warmer atmosphere- air holds more moisture
Heavy rainfall increases
How does climate change affect distribution of tropical storms?
Warmer seas- source areas further north and south of equator
Higher sea levels mean low-lying coastal areas affected
How does climate change affect intensity of tropical storms?
Every 1ºc increase in sea temp means 3-5% increase in wind speed
What are the 3 types of plate boundaries?
Constructive
Conservative
Destructive;
-subduction zones
-collision zonesWhat are constructive plate margins?
Plates pull apart
Magma fills gap between and solidifies
Earthquakes and volcanoes
Mid Atlantic ridge
What are conservative plate boundaries?
Plates slide past each other
Get stuck and pressure builds
Earthquake
San Andreas fault
What are destructive subduction vs collision zones?
Subduction: oceanic and continental. Oceanic sinks. Ocean trench. Earthquake due to pressure. Rock melts and magma builds- volcano
Collision: continental and continental. fold mountains. Deposits are pushed together. Causes earthquakes.
What are focus points?
Deep in the mantle
Deeper in, less impact on surface
<70km: shallow focus
What makes the plates move?
Convection currents
What is a natural hazard?
A physical event with the potential to do damage to animals and humans.
What factors affect hazard risk?
Deforestation
Wealth (LICs less tech to protect themselves)
Population growth (more likely for high death rate)
Climate change
