ENVR 1104 Chapter Notes -Federal Emergency Management Agency, Arctic Ocean, Positive Feedback
13 Feb 2014
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Chapter 1: natural hazards and disasters: hazard: A natural process becomes a natural disaster when it poses a threat to human life or property. A natural hazard then becomes a disaster when there are significant damages and casualties: predictions: A prediction does not account for probability. Magnitude and frequency curves allow someone to make a prediction. Positive feedback loop= when the increase in one factor (a), causes a change in other environmental factors, ultimately increasing a even more. Ex: global warming causes more rapid melting of the arctic sea, the resulting darker sea water absorbs more of the suns energy than the white ice does, causing higher temperatures and even faster melting. Negative feedback loop= when the increase in one factor may lead to a decrease in a related result. Ex: when cost of a product goes up, the use: precursor events: on that product goes down.
