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the challenges of natural hazards (natural hazards (definition: are…
the challenges of natural hazards
natural hazards
definition: are naturally occurring physical phenomena, which pose a potential risk to human life and/or damage to property
deforestation: the removal of trees increases the likelihood of flooding and landslides
poverty: in developing countries people are forced to live in areas at greater risk for example on unstable slopes prone to floods and landskapes
climate change: as temperature gets warmer there will be more tropical storms, areas where it is wetter may become flooded ans other areas could be drier with an increased risk od droughts.
urbanisation: densely populated areas at a greater risk from natural hazards.
tectonic hazards
there are two types of crust: oceanic and continental crust
plates move due to heat deep within the earths core causing convection currents in the mantle or due to slab pull a ridge push
the earths crust splits into a number of plates
tectonic activity at plate margins causes earthquakes and volcanoes
oceanic and continental crust
constructive plate margins
conservative plate margins
weather hazards
areas of low pressure are found where the air is rising foe example at the equator. winds on the ground move towards areas of low pressure.
winds on the ground transfer heat and moisture from one area to another
areas of high pressure are found where the air is sinking towards the ground, for example at the north pole. winds on the ground move outwards from areas of high pressure.
patterns of pressure belts and winds are affected by the seasons and the tilt and rotation of earth.
climate change
seasonal changes e.g. the UK growing seasons in lengthening
rising sea levels
when ocean water warms up. it expands in volume. this is known as thermal expansion
due to temperatures rising more water flows into the ocean from glaciers and ice caps
sinking glaciers and melting ice
high amounts of pollution also contribute to this the pollution levels are rising
burning fossil fuels contributes
