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GOPH 375 (1)
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Chapter 1

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GOPH 375
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Chapter 1 Not responsible for Population Growth (pg 14-16) What is a Natural Disaster?  A natural disaster is a natural occurrence in which a large amount of energy is released in a short amount of time, and causes loss of life (human or otherwise) or damage to property/economic losses  Natural disasters are often triggered when society ignores hazardous conditions in nature  Deadliest natural hazards are hurricanes and earthquakes (Table 1.2) o Others: floods (cause landslides), volcanic eruptions (landslides)  Measuring hazards o Disaster frequency: number of occurrences in a given length of time o Return period: length of time between similar events (inverse of frequency) o Magnitude: amount of energy fuelling a natural event  Figure 1.1 graph o Smaller energy releases all the time, bigger energy releases…  Figure 1.2 o Geological disasters: earthquakes, volcanoes, mass movements o Weather disasters: heat waves, drought, wildfires flood, storms – cause of most Canadian natural disasters - drought o Changing weather patterns may increase the frequency of natural disasters  Table 1.3  More densely populated places have more fatalities in a natural disaster than less populated  Vulnerability: likelihood that a community will suffer, in terms of fatalities and physical damage  Risk: product of vulnerability and hazard; risk = vulnerability X hazard  Our dependence on technology makes us vulnerable; domino effect when one system goes out  Poorer countries are less equipped to deal with natural disasters and thus sustain more fatalities  PCP: Canada’s emergency management o Response: immediately after emergency o Recovery: ”back to normal” o Mitigation: reduce risk o Preparedness: proactive plans for disasters Chapter 2  Internal o 50% radioactive decay o 50% “fossil” heat left over from planetary differentiation o Convection, denser materials go down  Table 2.3 o 99.97% sunlight energy on Earth’s surface o 0.025% Internal energy o 0.0017% Tidal Energy  Albedo: Planetary body. Range of albedo’s: o 90% reflected o 2%...  Table 2.25: 30% of light that comes into the atmosphere is reflected…  Earth’s albedo is sensitive to atmosphere and cloud cover percentage  Kinetic energy in Earth’s orbital system. Delivered to Earth
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