Natural Hazards 1
- Created by: liv.moz
- Created on: 08-05-22 14:04
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- Natural Hazards 1
- Natural Hazards
- It is an extreme natural event that can cause loss of life and extreme damage to properties.
- Types of natural hazards are: Tectonic, Atmospheric, Geomorphical and biological.
- Tectonic: earthquakes and volcanoes.
- Atmospheric: hurricanes
- Geomorphological: flooding and landslides
- Biological: forest fires
- A hazard risk is the probability that a natural hazard will actually affect a population.
- Factors affecting hazard risk: social, environmental and economic.
- Other: urbanisation, population growth, wealth, climate change, poverty and hazardous living conditions.
- Factors affecting hazard risk: social, environmental and economic.
- The Earth
- The 4 layers: inner core, outer core, mantle, crust
- OCEANIC CRUST: Under seas/oceans, thinner (8-12km), HEAVY Basaltic rock
- Can be subducted
- CONTINENTAL CRUST: On land, thicker (30-65km), LIGHT Granitic rock
- Less often destroyed.
- OCEANIC CRUST: Under seas/oceans, thinner (8-12km), HEAVY Basaltic rock
- The 4 layers: inner core, outer core, mantle, crust
- Tectonic Hazards
- Continental drift theory is the idea that the plates slowly shift their position on the earth.
- Tectonic plates are the Earth's crust split up into multiple large slabs.
- Convection currents is the transfer of heat from the core to the crust.
- 1. Core heats up magma in mantle, hot magma less dense than surroundings so it rises.
- 2. When it reaches the top it cools. Becomes less dense and therefore sinks back down.
- 3. Heated up again, cycle continues.
- 4. Plates are pushed and pulled by CC.
- 3. Heated up again, cycle continues.
- 2. When it reaches the top it cools. Becomes less dense and therefore sinks back down.
- 1. Core heats up magma in mantle, hot magma less dense than surroundings so it rises.
- Plate boundaries: Constructive, Collision, Destructive, Conservative
- Tectonic hazards occur on plate margins.
- Earthquakes are found along all types of plate margins.
- We can measure earthquakes by using the Richter Scale, which measures the magnitude of a tremor.
- By using an instrument called a seismograph.
- We can measure earthquakes by using the Richter Scale, which measures the magnitude of a tremor.
- Earthquakes are found along all types of plate margins.
- Continental drift theory is the idea that the plates slowly shift their position on the earth.
- Plate margins
- Constructive: 1.Plates pulled apart by CC, magma rises between them and forms volcanoes.
- 2.Lava cools and solidifies= new crust.
- 3.Movement of crust causes small earthquakes
- 2.Lava cools and solidifies= new crust.
- Destructive:1.Plates move towards eachother. Heavier oceanic plate move under continental.
- 2.Plates rub together causing severe earthquakes.
- 3.Friction and heat from mantle heats rock, magma rises and violent colcanic eruption happens.
- 2.Plates rub together causing severe earthquakes.
- Conservative: 1. Plates try to slide past eachother, plates stick together.
- 2.Huge amounts of pressure build up, pressure release causes violent earthquake.
- 3.Plates move on a few milimetres. No volcanic activity.
- 2.Huge amounts of pressure build up, pressure release causes violent earthquake.
- Constructive: 1.Plates pulled apart by CC, magma rises between them and forms volcanoes.
- Natural Hazards
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