EARTH 20 Lecture Notes - Lecture 1: Plate Tectonics, Natural Disaster
Document Summary
Processes: physical, che(cid:289)ical, a(cid:290)d biological (cid:363)ays i(cid:290) (cid:363)hich e(cid:362)e(cid:290)ts affect earth"s surface. Plate tectonics (result in earthquakes, volcanic eruptions, etc. ) Energy source: internal energy of the earth. External processes: co(cid:289)e fro(cid:289) forces o(cid:290) earth"s surface. Hazard: natural process or event that is a potential threat to human life or property (ex. Disaster: hazardous event that occurs over a limited time in a defined area. Criteria: 10/more people killed, 100/more people affected, state of emergency declared, request for international assistance. Earthquakes, tsunamis, volcanoes, severe weather, climate change, fires, mass movements, floods, impacts (ex. asteroids), mass extinctions. Indonesian tsunami (2004), hurricane katrina (2005), haiti earthquake (2010), No increase in earthquakes, but increase in human toll (bc more developed) Increase in number and intensity of hurricanes due to global warming and heating of ocean waters. Un (cid:799)99(cid:798)"s (cid:907)decade for natural hazards reductio(cid:290)(cid:908) Mitigation: reduce effects of something (ex. earthquake), form of natural disaster preparation. 2010: 228,000 people killed (mostly in haiti earthquake)
