Natural Hazards
All infomation from CGP geography 9-1 revision guide
- Created by: L1ttle M
- Created on: 19-03-18 19:52
View mindmap
- Natural Hazards
- Earthquakes
- can happen at all three types of plate margin
- caused by tension building up at the plate margin
- Conservative margins - tension builds up when plates that are grinding past each other get stuck
- the plates eventually jerk past each other, which causes vibrations known as earthquakes
- Constructive Margin - tension builds along cracks within the plates as they move away from each other
- the shock waves spread out from the focus, the closer to the focus the stronger the waves and the more damage caused
- focus - the point in the earth where the earthquake starts
- the plates eventually jerk past each other, which causes vibrations known as earthquakes
- Constructive Margin - tension builds along cracks within the plates as they move away from each other
- Destructive Margins - tension builds up when one plate gets stuck as it's moving down mast the other into the mantle
- the plates eventually jerk past each other, which causes vibrations known as earthquakes
- the shock waves spread out from the focus, the closer to the focus the stronger the waves and the more damage caused
- focus - the point in the earth where the earthquake starts
- the shock waves spread out from the focus, the closer to the focus the stronger the waves and the more damage caused
- the plates eventually jerk past each other, which causes vibrations known as earthquakes
- Conservative margins - tension builds up when plates that are grinding past each other get stuck
- the epicentre - the point on the earth's surface directly above the focus.
- measured using the moment magnitude scale
- Volcanoes
- destructive plate margins
- the oceanic plate goes under the continental plate because it is denser
- the oceanic plate moves down into the manltle where it is melted and destroyed
- a pool of magma forms
- the magma rises through cracks in the mantle called vents
- the magma erupts onto the surface forming a volcano
- the magma rises through cracks in the mantle called vents
- a pool of magma forms
- constructive margins
- magma rises up into the gap created by the plates moving apart forming a volcano
- some volcanoes form over parts of mantle that are really hot (hot spots)
- for example in Hawaii
- when a volcano erupt it emits lava and ash
- some volcanoes emit lots of ash
- it can cover land
- it can block out the sun
- it can form pyroclastic flows
- some volcanoes emit lots of ash
- destructive plate margins
- Earthquakes
Comments
No comments have yet been made