Global Hazards Flashcards
Rising air leads to…
Low pressure which is wet
Falling air leads to…
High pressure which is dry
Global circulation system
Movement of air around the globe
Where are the Hadley cells
0 to 30
Where are the Ferrell cells
30 to 60
Where are the polar cells
60 to 90
Conditions at equator
Low pressure, wet
Conditions at 30
High pressure, dry(deserts)
Conditions at 60
Low pressure, wet, caniferous trees
Conditions at the poles
High pressure, dry
Conditions for a tropical storm to form
Large body of water
Temperature above 26.5
Low altitude wind
Low pressure
Where and when do tropical storms happen
5-30 N/S
Happens in summer for the west
Happens in winter for the east
Collision plate boundary
Continental on continental
Causes earthquakes
Punch each other up
Creates mountains
Destructive plate boundary
Continental on oceanic
Creates volcanoes
Oceanic sinks under continental
Conservative plate boundary
Happens between any plate
Causes earthquakes
Plates get stuck while going past each other
Pressure built up causes them to shoot apart
Constructive plate boundary
Oceanic on Oceanic
Causes earthquakes and gentle volcanoes(specifically shield)
Plates pull apart causing magma to flow up
Hot spots
Hot plume under the mantle(this is a constant and won’t move)
Hot plume causes a volcano which will become an island
Is like a conveyor belt
Continental
Under land
Old
Light
Buoyant
Contains granite
Oceanic
Under water
Really young
Thin but heavy
When it sinks it is destroyed and replaced
Often contains basalt
