World at Risk 2

olw-1234
Mind Map by , created over 6 years ago

Physical Geography- World at Risk Mind Map on World at Risk 2, created by olw-1234 on 05/02/2013.

332
1
0
olw-1234
Created by olw-1234 over 6 years ago
Global Hazards- The Future
olw-1234
Coping with Climate Change
olw-1234
Climate Change- Case Study- Africa
olw-1234
AS AQA Accounting Unit 1 - FLASH CARDS
Harshad Karia
1PR101 2.test - Část 6.
Nikola Truong
Disaster Hotspot Case Study- Philippines
olw-1234
Disaster Hotspot Case Study - California
olw-1234
Evidence of Climate Change
olw-1234
Causes of Climate Change
olw-1234
Climate Change- Case Study Arctic
olw-1234
World at Risk 2
1 Hazard distribution
2 Geophysical hazards usually occur near plate boundaries
2.1 Earths crust made up of huge plates called tectonics
2.2 Two types
2.2.1 thicker (less dense) is the continental crust
2.2.2 Thinner (more dense) is the oceanic crust
2.3 Plates move because of convection currents in the mantle these are caused by temperature differences within the mantle
3 Volcanoes and earthquakes occur at constructive boundaries
3.1 Constructive- 2 plates move apart
3.2 Mantle is under pressure from plates above
3.3 when they move pressure is released this causes mantle to melt and produce magma
3.4 Magma is less dense than the plate above so it rises and erupts
4 Volcanoes and earthquakes also occur at destructive boundaries
4.1 Destructive- when 2 plates move towards each other
4.2 Continental and oceanic crust move towards each other more dense oceanic is forced under the continental plate.
4.3 Oceanic is heated b friction and contact with the upper mantle which melts the magma
4.4 magma is less dense than the continental crust and will rise back to the surface to form a volcano
5 Earthquakes also occur at conservative boundaries
5.1 conservative- when 2 plates are moving apart
5.2 2 plates get locked together in places and pressure builds up
5.3 Causes plates to jerk past each other releasing the energy as an earthquake
6 Tropical cyclones occur over warm water
6.1 develop above water 26.5C or higher Moist air rises and condenses it releases energy which increases wind speed
6.2 loses strength when over land because energy supply is cut off
6.3 occur between 5 and 30 north and south of the equator
6.4 Cyclones spin because of the Coriolis effect force that deflects the path of winds due to the earths rotation
6.4.1 This is why they move away from the equator
7 Volcanoes also occur away from plate boundaries
7.1 These volcanoes are thought to be caused by magma rising from large chamber beneath the crust

Media attachments