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SHHS - Geography - AQA New GCSE > Natural Hazards > Flashcards

Flashcards in Natural Hazards Deck (85):

Define 'natural hazard'

A natural event (for example earthquake, volcanic eruption, tropical storm, flood) that threatens people or has the potential to cause damage, destruction and death.”


What are the two main categories of natural hazard, give some examples of each

Atmospheric/ Meteorological  (to do with the weather): Tropical storm, heatwave, blizzard, heavy rain

Geological (to do with the surface of the earth): volcano, earthquake, landslide


List 3 factors that affect the risk of hazards?

Urbanisation: densely populated urban areas will have a greater risk from hazards. Wealth: poor countries will be less able to prepare for, and respond to hazards Frequency: places that have multiple hazards, or frequently experience hazards will deal with them differently.


What is plate tectonics theory?

A theory that explains how the Earth is structured and what it is made up of.


Describe the distribution of earthquakes and volcanoes

Earthquakes and volcanoes are primarily found along plate margins for example the edge of the Pacific Ocean (the "Ring of Fire) and in the middle of the Atlantic Ocean. There are however some that are found in the middle of tectonic plates


List 4 primary effects of Tyhoon Haiyan

  • 6,300 people were killed, mostly drowned by the storm surge
  • 600,000 were displaced
  • 40,000 homes were destroyed
  • Strong winds damaged buildings and power lines and destroyed crops


List 4 secondary effects of Typhoon Haiyan

  • 14 million people were left homeless and 6 million lost their source of income (mainly fishing)
  • There was looting and violence in Tacloban
  • There was a shortage of food, and rice prices increased by 12%
  • Power supplies in some areas were down for 1 month


List 4 immediate responses to Typhoon Haiyan

  • 800,000 people were evacuated by the Government
  • 1200 evacuation centres were set up
  • 1 million food packs and 250,000 litres of water were sent by charities such as the Philippines Red Cross
  • The UK Government send shelter kits, each one providing emergency shelter for one family


List 4 long term responses to Tyhpoon Haiyan

  • Rebuilding of raods, bridges and airport facilities
  • Charities such as Oxfam helped replace fishing boats, which are a vital source of income
  • Thousands of homes rebuilt away from areas at risk of flooding
  • More shelters built to accomodate people evacuated from coastal areas


What happened during Typhoon Haiyan?

Typhoon Haiyan was a category 5 Tyhpoon (tropical storm).  There were winds of up to 275 km/hour and waves as high as 15m.


When was Typhoon Haiyan?

Typhoon Haiyan happened on 8th November 2013


List 4 ways in which we can protect against a tropical storm


Reinforce windows, doors and roofs to withstand strong winds

Houses close to the coast can be built on stilts so that a storm surge passes beneath them.

Storm drains built in urban areas to take away excessive amounts of rainfall and prevent flooding

Sea walls built to protect key properties from storm surges


List 2 ways a tropical storm can be monitored and predicted

  1. Satellites monitor the clouds for the classic cloud pattern associated with tropical storms
  2. Supercomputers such as those developed by the National Oceanic and Atmospherice Administration (NOAA) try to predict the path of tropical storms


List 4 ways in which we can plan to reduce the effects of tropical storms


In the USA they have National Hurricane Preparedness Week so people can be educated on the possible dangers of tropical storms.

Try to limit the amount of building that is done on low lying or vulnerable areas

Make sure you are prepared personally: petrol in the car, food and supplies at home.

People can be supplied with disaster preparation kits


What type of weather hazard does the UK experience?

Heavy rain



High winds (gales and storms)

Extreme cold (snow and ice)


What caused the Somerset Floods?

  • Wettest January since 1920, 350mm of rain fell in January and February (100 mm above the average)
  • The land in Somerset is very low-lying, with several rivers all flowing into the Severn estuary
  • High tides and storm surges swept water up the rivers.
  • Rivers hadn't been dredged in at least 20 years meaning they were clogged with sediment


What were the social impacts of the Somerset Floods?

  1. 600 houses flooded
  2. 16 farms evacuated
  3. Many residents in temporary accomodation for several months.
  4. Villages such as Moorland and Muchelney cut off completely


What were the economic effects of the Somerset floods?

  1. Somerset Council estimated the cost of the flooding to be more than £10 million
  2. Over 14000 hectares of agricultural land underwater for 3 - 4 weeks (loss of income for farmers)
  3. Bristol to Taunton railway line was closed at Bridgwater


What were the environmental impacts of the Somerset floods?

  1. Floodwaters were heavily contaminated with sewage and other pollutants
  2. Huge amount of debris had to be cleared
  3. Stagnant water that had collected for months had to be treated before it could be pumpted back into rivers


What were the short term responses to the Somerset Floods?

  1. Villagers used boats to go shopping and get to scool
  2. Local community groups and volunteers provided support
  3. Neighbouring farms offered to take in animals that were stranded


What were the longer term responses to the Somerset Floods?

  1. £20 million Flood Action Plan to reduce the risk of future flooding
  2. 8km of rivers were dredged to increase the capacity of the River Channel
  3. Vulnerable locations will have flood defences built
  4. Road levels have been raised


State 3 bits of evidence for climate change?

1. Ice cores - gases trapped in the ice can tell us what the temperature was like up to 400,000 years in the past.

2. Shrinking glaciers - Arctic sea ice has thinned by 65% since 1975.

3. Tree rings - the thickness of each ring shows us what the climate was like over the last 10,000 years


What are the 3 natural causes of climate change

  1. Orbital changes (Milankovitch Cycles): The Earth's orbit around the sun changes in 3 ways: the tilt on it's axis, the shape of the orbit, and the 'wobble' of it as it spins.  This means we are either closer to, or further away from the sun.
  2. Sunspot theory: When the surface of the Earth has more 'sunspot activity', the temperature is warmer
  3. Volcanic eruptions: These put large amounts of gas and ash into the atmosphere blocking out the sun, and lowering the temperature


State 3 types of greenhouse gas, with an example of an activity that causes it

1. Carbon Dioxide: burning fossil fuels for electricity, driving cars, deforestation, burning wood

2. Methane: farming rice, decaying material in landfill, farming cows

3. Nitrous oxide: Sewage treatment, car exhausts, agricultural fertilisers


List 3 social effects of climate change

  1. Approximately 70% of Asia may be at risk of flooding from sea level rise
  2. In Europe more heat waves can increase deaths
  3. Drought is likely to put pressue on food and water supplies in sub-Saharan Africa


Name the three cells in the tri-cellular model

Hadley cell

Ferrel cell

Polar cell


Which cell of air lies between the tropics and the Equator?

The Hadley Cell


Which cell is associated with bringing very cold winter weather?

The Polar Cell


What is a tropical storm?

A huge storm which develops in the tropics. The storms are powerful and are associated with strong winds and torrential rain.


Where do tropical storms form?

- over warm oceans (27 degrees C)

- 5-15 degress north and south of the equator

- Where intense heat makes the air unstable causing air to rise rapidly.


What temperature does the sea need to be for a tropical storm to form?

27 degrees


What are the three names for tropical storms and where are they located?

Cyclones - South east Asia and Australia

Typhoons - Japan and the Phillipines

Hurricanes - USA and Caribbean


When evaporated air rises it cools and condenses to form what?



What is the name of the thunderstorm clouds associated with tropical storms?

cumulonimbus clouds


What speed does the wind need to be to offically become a tropical storm?

74 MPH


Why do tropical storms spin?

The Coriolis force caused by the rotation of the Earth


What is the centre of the tropical storm called?

The eye


Why is the eyewall so dangerous?

Carries the most intense weather conditions (strong winds and heavy rain)


What happens to the storm as it reaches land?

Loses energy as friction with the land slows it down. Energy supply (evaporated water) is also cut off.


What is the Saffir-Simpson scale?

Hurricanes are measured using this scale. Catergory 1 - 5. 5 is the strongest.


List 4 features in the structure of a tropical storm

- Torrential rail bands

- Winds stronger than 74 MPH

- Eye and eye wall

- Up to 300 miles long

- Up to 14 km high


How will climate change affect the distribution of tropical storms?

Hazard zone may increase to outside the tropics and equatorial regions.


How will climate change affect the frequency of tropical storms?

Decrease frequency


How will climate change affect the intensity of tropical storms?

Intensity might increase. Intensity in the North Atlantic has risen in the last 20 years.


List 3 environmental effects of climate change

  1. Wildlife will be threatened by increased temperatures and food shortages i.e. polar bears in the Arctic, Adelie penguins in Antarctica, orangutans in Borneo
  2. Warmer rivers affect marine wildlife.
  3. Coral reefs such as the Great Barrier reef could cause bleaching of the coral reefs


List 3 economic effects of climate change

  1. Many countries will have to pay for flood defences to protect themselves from sea level rise.
  2. Ski resorts in places such as the Alps may have to close, or have shorter seasons.
  3. New crops might be able to be grown in places i.e. grapes in the UK (positive)



What happens at a constructive plate boundary?

  • Convection currents in the mantle cause the oceanic plates to move apart from one another.
  • Magma rises between the plates, hardens and cools to form new oceanic floor
  • This causes earthquakes and shield volcanoes

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What happens at a destructive plate margin?

A continental and oceanic plate are moving towards each other.

The oceanic plate subducts beneath the continental plate because it is denser and heavier.

This plates melts into the magma.

The continental plate is pushed upwards to form fold mountains and a composite volcano is formed

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What is a primary imapct?

An direct impact of an event (e.g. houses collapse in an earthquake, flooding caused by a tropical storm).


What is a secondary impact?

The indirect impact of an event. The 'knock on' effects. (For example, a tropical storm causes flooding but the knock on effects of flooding could be a landslide). Flooding is a primary impact, the landslide is the secondary impact.


When did Typhoon Haiyan hit the Philippines?

November 2013


What category was Taiphoon Haiyan?

Category 5


How strong were the winds during Typhoon Haiyan?



How high were some of the waves caused by Typhoon Haiyan?

Up to 15m


Name a city that was badly affected by Typhoon Haiyan?



How many people were left homeless in Tacloban?

Most of the 220,000 residents


What caused most of the damage in Tacloban during Typhoon Haiyan?

A 5m high strom surge


What is a storm surge?

A wall of water, similar to a tsunami. Strong winds force the sea onshore, forming a wall of water several meters high.


What might you find in a shelter box?

  • Tool kit
  • Family tent
  • Thermal blankets
  • Mosquito nets
  • Water containers
  • Cooking equipment
  • Hat, scarf, gloves
  • Children's activity pack 


What is your MEDC earthquake case study?

L'Aquila (Italy)


When was the L'Aquila Earthquake?

6th April 2009


What magnitude was the L'Aquila earthquake?



List 4 primary effects of the L'Aquila earthquake

  • 300 deaths
  • 1500 injured
  • Over 60,000 made homeless
  • A bridge near Fossa collapsed
  • Water pipe was broken near the town of Paganica
  • Tens of thousands of buildings were damaged or destroyed


List 4 secondary impacts of the L'Aquila earthquake

  • Aftershocks made rescue efforts more difficult and caused more damage
  • Fires in some collapsed buildings caused more damage
  • Broken water pipe near Paganica caused a landslide
  • Electricity and phone services were interrupted


List 4 immediate responses to the L'Aquila earthquake

  • Camps were set up for people who were made homeless- providing water, food and medical care.
  • Ambulances, fire engines and the army were sent to rescue survivors
  • Cranes and diggers removed rubble
  • Free mobile phones and SIM cards were provided to people who had lost their home
  • Money was provided by the government to pay rent, and gas and electricity bills were suspended


List 3 long term responses to the L'Aquila earthquake

  • New settlements were built to accommodate over 20,000 residents who used to live in the damaged city centre.
  • Most of the city centre is being rebuilt, but there have been criticisms over delays.
  • An investigation was set up into why modern buildings weren't built to withstand earthquakes.


When was the Nepal earthquake

25th April 2015


What was the magnitude of the Nepal earthquake?



Where was the epicentre of the Nepal earthquake?

50miles NW of Kathmandu


What boundary did the Nepal earthquake happen on?

Collission (Eurasian Plate and Indo-Australian Plate)


How deep was the focus of the Nepal earthquake?

15km (very shallow so very powerful)


List 4 primary effects of the Nepal earthqauke

  • 9,000 deaths
  • 20,000 injured
  • 8 million people affected
  • 3 million left homeless
  • Electricity and water supplies affected
  • 1.4 million people needed food, water and shelter
  • $5billion damages


List 4 secondary effects of the Nepal earthquake

  • Landslides and avalanches
  • Landslides blocked roads so made recovery more difficult
  • Avalanches on Mount Everest killed 19 people
  • An avalanch in Langtang left 250 peopl missing
  • A landslide blocked the Kali Gadaka River, people were evacuated in case of flooding


What were the immediate responses to the Nepal earthquake?

  • Search and rescue teams arrived quickly from other countries (e.g. UK, China and India)
  • Helicopters rescued people who were caught up in the avalance on Mount Everest
  • Helicopters delivered supplies to remote village cut off by landslides
  • Half a million tents needed to provide shelter to the homeless
  • Financial aid sent by many countries
  • Temporary 'field' hospitals set up to support overcrowded hospitals
  • 300,000 people migrated from kathmandu to seek shelter and support from family and friends
  • Social media used widely to help with search and rescue


What were the long term responses to the Nepal earthquake?

  • Roads repaired and landslides cleared
  • Over 7000 schools repaired or re-built
  • Stricter building controls
  • June 2015 Nepal hosted an international conference to discuss reconstructions and seek support from other countries
  • Repairs to Everest base camp and tekking routes (by Auguest 2015 new routes were built and old one re-opened)
  • Plans were made to boos tourism, by July 2015 some heritage sites had reopened and tourists started to rertun.


What is an immediate response?

The responses that happen straight away after an event, in the minutes, hours and days after. E.g. search and rescue, providing medical care, food, water and shelter.


What is a long term response?

The responses to an event that happen in the months and sometimes years after the event, for example re-building and getting people's lives back to normal.


What happens at a conservative plate boundary?

  • Convection currents in the mantle cause two tectonic plates to slide past each other.
  • They might be going in different directions, or the same direction but at different speeds.
  • This causes earthquakes, but not volcanoes

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From the inside out, label the sections of the structure of the Eart

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What are the 2 types of crust?

Oceanic and continental


State 2 differences between continental and oceanic crust

  1. Oceanic is denser than continental crust
  2. Oceanic is thinner than continental crust


There are two ways to manage climate change - what are the two strategies called and can you define them?

Mitigation: Trying to stop the problem

Adaptation: Trying to cope with the effects


Give 4 examples of mitigation strategies to manage climate change

  1. Using alternative renewable energies i.e. wind, solar and wave - these do not produce as much CO2
  2. Afforestation (planting trees) - trees are a 'carbon sink' and help remove CO2 from the atmosphere
  3. International agreeements - signing up to treaties such as the Kyoto Protocol.
  4. Carbon capture technology - removing CO2 from fossil fuels when they are burnt


Give 4 examples of adaptation strategies to manage climate change.

  1. Investing in flood defences in coastal/ low lying areas
  2. Developing drought resistant crops to cope with water shortages
  3. Conserving water to cope with water shortages
  4. Desalination - making sea water useable.