Pages in this set

Page 1

Preview of page 1
UNIT 1: World At Risk




GLOBAL HAZARDS

Hydro-meteorological ­ caused by climate. Remember Hydro = Water =Floods ect.

Floods
Mudflows
Hurricanes , Storm surges
Thunder and hail storms
Rain wind blizzards
Drought -> Bushfires

Geophysical ­ caused by land processes

Tectonic

Earthquakes
Tsunamis
Volcanic activity

A natural Hazard- is a…

Page 2

Preview of page 2
UNIT 1: World At Risk




HUMAN FACTORS PHYSICAL FACTORS

Rapid population growth ­ more people Global warming ­ more disasters occurring, higher
vulnerable to hazards severity
Increasing world poverty ­ poor people more El Nino ­ change global weather in an unpredicted
vulnerable way, making hydro meteorological hazards more
unpredictable…

Page 3

Preview of page 3
UNIT 1: World At Risk




Australia Bushfires

Occur every summer.
Significant property damage average 84 properties a year
There are fewer deaths now average of just 5 every year.

How have bushfires start?

Deliberately
o Carelessness outdoor BBQ, Cigarette stub
Lightning strike
Once started difficult to stop

3 Types of…

Page 4

Preview of page 4
UNIT 1: World At Risk




In December 2006 North London, was hit by a tornado that was so localised it only
effected a few streets. In just a few minutes roofs from cars were ripped off, trees
were brought down, and cars damaged or crushed by falling debris.
Occur as…

Page 5

Preview of page 5
UNIT 1: World At Risk




Low Middle Income country $5000 per capita
Plate boundary DESTRUCTIVE (Philippine subducts Eurasion)
o So it is at risk of volcaneoes e.g. Mount Pinatubu 2001 7000 deaths
o And Earthquakes, where plates have cracked e.g. 1990 7.8 magnitude in
Luzon 1,500 killed
Landslides Because of…

Page 6

Preview of page 6
UNIT 1: World At Risk




Most African economies are heavily dependent on agriculture, farming is rainfed and
vulnerable to rainfall shortages. (Kenya rainfall expected to increase)
70% of Africans are farmers
Refugees from low lying coastal areas move to centre e.g. Lagos
60% of Africans live on coastal areas at…

Page 7

Preview of page 7
UNIT 1: World At Risk




Oceanic & Continental crust move together ­ MORE DENSE OCEANIC gets subducted
The oceanic crust is heated by friction ­ melts into magma
Magma is less dense than continental crust ­ rises to the surface (forming volcanoes)

EARTHQUAKES

The more dense plate gets subducted (oceanic…

Page 8

Preview of page 8
UNIT 1: World At Risk




Shift between cold glacial periods (last 100,000 years) and warmer inter-glacial periods (last
around 10,000 years)




Medium-Term Climate Change...

Climate switches from cool to warm every few 1000 years or so
Around 5000 years ago temperatures were 1-2 degrees higher than they are today




Short-Term…

Page 9

Preview of page 9
UNIT 1: World At Risk




1) VARIATION IN THE EARTHS ORBIT:



Stretch ­ Orbit goes from a perfect circle to an ellipse every 96,000 years, changing the
distance from the earth to the sun, changing the amount of energy received from the sun
Tilt ­ Earth is tilted (called its…

Page 10

Preview of page 10
UNIT 1: World At Risk




In the 1980's UK scientists discovered thinning in the ozone layer caused by CFC'S
Methane- minor gas but very effective in retaining heat.




2) DESTRUCTION OF NATURAL CO2 SINKS:



CO2 sinks store CO2 (so it's not contributing to the atmosphere)
Biggest sinks are oceans (CO2…

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »