EESB18H3 Lecture Notes - Subduction, Seafloor Spreading, Plate Tectonics
Document Summary
Risk - probability of event occurring multiplied by impact on people and property. Disaster effect of hazard on society -> property damage, injury, loss of life. Hazards can actually provide a benefit -> (ex) rich soil near volcanoes and on floodplains. Increases in population pressures people to live in dangerous areas (prone to hazards) Hazards come from natural processes, which are understandable -> hazards are predictable. Result od internal energy of the earth. Geological cycle processes involving materials on or near the earth"s surface; including tectonic cycle, rock cycle, hydrologic cycle and biogeochemical cycles. Tectonic cycle involves the creation, movement and destruction of tectonic plates. Explains the dynamic processes of the earth"s surface. Due to the internal energy of the earth. Layers crust (continental and oceanic), mantle (asthenosphere (upper mantle(weaker layer beneath the lithosphere))), outer core and inner core) Lithospheric plates not a continuous layer, broken into plates. Move relative to each other a few cm/year.
