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Type of Hazard

This unit is all about Natural hazards.  AQA define natural hazards as;
A natural event (for example earthquake, volcanic eruption, tropical storm, flood) that threatens people or has the potential to cause damage, destruction and death.”
The key part of the definition is the threat to human populations and their properties.  There are many natural events around the globe that do not occur in close proximity to people so do not pose a hazard.  When natural events occur close to large or vulnerable populations we have a natural hazard on our hands.
There are different types of natural hazards that can affect people around the globe, including;
Atmospheric hazards - Created in the atmosphere, by the movement of air and water
Terrestrial/Geological hazards  - Created by the movement of the Earth's tectonic plates  or surface rock and soils
Water based hazards - Created by rivers, sea or oceans
Biological Hazards - Any biological substance that poses a threat to the health of people

Nine deadliest natural disasters since 1900

Rank Death toll (estimate) Event Location   Date
1 1,000,000–4,000,000 1931 China floods China  July 1931
2 450,000 (242,000–655,000)  1976 Tangshan earthquake  China  July 1976
3 375,000 (250,000–500,000)  1970 Bhola cyclone East Pakistan (now Bangladesh) November 1970
4 280,000  2004 Indian Ocean earthquake and tsunami  Indian Ocean  December 26, 2004
5 273,400 1920 Haiyuan earthquake China  December 1920
6 229,000 Typhoon Nina—contributed to Banqiao Dam failure China August 7, 1975
7 160,000  2010 Haiti earthquake  Haiti January 12, 2010
8 145,000 1935 Yangtze river flood  China 1935
9 142,000  1923 Great Kanto earthquake Japan September 1923

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