Geography 2152F/G Lecture 1: Hazards Notes until midterm
24 Apr 2017
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Toxic gas: oil spills, ozone depletion, acid rain, airplane crashes. Internal forces within earth: driven by earths internal energy, ex: plate tectonics. External forces: suns energy, ex: atmospheric effects. Catastrophe: massive disaster: hurricane katrina 2005, tsunami thailand december 2004, japan march 2011, earthquake haiti january 2010, oil spill gulf of mexico, april 2010. Hazards differ in potential to cause catastrophe: more likely to be catastrophic: tsunamis, earthquakes, volcanoes, hurricanes, floods, less likely: landslides, avalanche, tornadoes. Earths internal structure: crust forms upper part of lithosphere and broken into plates. Plate tectonics: two types of crust, asthenosphere: upper mantle composed of hot magma with some flow, lithosphere thin and brittle crust, oceanic dense, thin (average of 7km thickness, continental buoyant, thick, (30km thickness) Oceanic plate would sink because it is denser: denser material goes under if the two meet, movement of plates driven by convection currents within mantle.
