Geography S3 revision 2017 Flashcards
(19 cards)
What is a natural hazard?
A natural hazard is an event that has the potential to affect people’s lives or property.
What are the causes of a natural hazard?
The causes of a natural hazard are landslides, volcanoes, earthquakes, Tsunamis, tropical storms, Avalanches, Droughts and Floods.
What is the Earth’s crust broken up into?
The Earth’s crust is broken up into a number of tectonic plates.
What is the bit between the two plates called?
The bit between the two plates is called a margin.
What do plates moving together form?
Plates moving together form a destructive plate margin.
What are plates moving apart called?
Plates moving apart are called constructive plate margins.
What are plates that move alongside other called?
Plates that move alongside each other are called conservative plate margins.
What is the focus?
The focus is the place where the earthquake starts under the earth.
What does immediate response mean?
Immediate response is help after a natural disaster happens to deal with urgent needs like shelter, food, medicine, machinery to lift destroyed buildings and rescue survivors.
What is the epicentre?
The epicentre is the point on the crust closest to the focus.
What can laser beams can be used for?
Laser beams can used to detect plate movement.
What can seismometers can be used for?
Seismometers can be used to pick up vibrations in the Earth’s crust.
What is global atmospheric circulation?
Global atmospheric circulation is the worldwide system of winds, which transports heat from tropical to polar latitudes.
In each hemisphere air circulates through the entire depth of the troposphere which extends up to 15km.
Why is this important?
It explains the location of world climate zones
It explains the distribution of weather hazards.
What is insolation?
Insolation is the amount of solar radiation an area receives over a specified amount of time.
This depends on latitude which is distance from the equator.
What happens in a hadley cell?
In a hadley cell the air rises at the equator. Air rises and starts to fall back at 30%.
What happens in a ferrel cell?
In a ferrel cell at 30% some of the air gets sucked to the Equator. At 60% air heats up and rises.
What are the conditions needed for a tropical storm?
Ocean warmer than 27%= warm, moist, rising air
Ocean with a depth of 60-70 meters= warm, moist, rising air
Low latitude=warm, moist, rising air
Low wind sheer= allows storms to form
What are the effects of global warming?
Uncertainty
Distribution of tropical storms
Storm surges
Frequency
Intensity
