GCSE: Geography B Tectonic Hazards

Tectonic Hazards:

  • Destructive
  • Constructive
  • Conservative
  • Earthquakes
  • Volcanoes
  • Impact
  • How to redeuce impact
  • LEDCS
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  • Created by: Shannon
  • Created on: 04-12-12 16:12
Preview of GCSE: Geography B Tectonic Hazards

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Tectonic Hazards
Tectonic plates
Inner core ­ Ball of solid iron and nickel
Outer core ­ Liquid
Mantle ­ Around core, semi ­ molten rock which moves slowly
Crust ­ Outer layer of Earth (very thin)
Continental crust:
Thicker than oceanic but less dense
Oceanic crust:
Thinner than continental but more dense
Destructive Boundary
Two plates move towards each other
Oceanic plate is if forced down under mantel as it is denser. It is then destroyed and creates
an volcano
Constructive Boundary
Plates are moving away from each other
Magma rises from the mantle to fill the gap and cools making new crust
Collision Boundary
Two plates moving in the same direction but at different speeds
Conservative Boundary
Two plates moving past each other
Earthquakes
Destructive:
Pressure builds up when one plate gets stuck as it's moving down past the other into the
mantle
Constructive:
Pressure builds up along cracks within plates as they move away from each other
Conservative:
Pressure builds when grinding plates get stuck
Plate jerk past each other sending out shockwaves

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Shockwaves spread out from focus
Epicentre ­ shockwaves are stronger and cause more damage
Magnitude of EQ is measured with Richter Scale
Impacts of Earthquakes
Primary:
Buildings collapsing
People being injured/killing
Road, railways and airport damaged
Electricity cables are damaged
Gas pipes ­ leak
Sewage pipes broken ­ leaks
Secondary:
Triggers landslides and tsunamis
Leaking gas = fires
People left homeless = Psychological problems
Unemployment
Lack of proper sanitation
Hard for emergency vehicles and Aid can't get through
LEDCS
Poor quality houses means they are…read more

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Destructive:
Oceanic plate moves down into the mantle ­ melted and destroyed
Magma is formed which rises through vents in crust and it erupts onto surface
Constructive:
Magma rises into the gap created by the plates moving away from each other
Impacts of Volcanoes
Primary:
Buildings and roads destroyed
People and animals killed or injured
Crops damaged
Water contaminated with ash
People, animals and plants suffocated by CO2 produced
Secondary:
Lahars form when volcanic material mixes with water
Fires started by lava flows
People are…read more

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