GEO 110 Lecture Notes - Lecture 11: Himalayas, San Andreas Fault, Subduction
5 Mar 2018
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Geo110 class 10 plate tectonics & related natural hazards. The big picture: pieces of earths surface, move around, grind sideways, collide, sink into earths hot interior, collisions create mountain ranges, causes tsunami, less directly, mountain ranges affect weather and climate. The crust: continental crust, thick, buoyant (less dense, mostly old, oceanic crust, thin, dense (sings under continental crust, young. Support of a theory: theory of plate tectonics was known as polar wondering, revised to continental drift, macro scientific supporting the theory, continental fit, fossils, rocks and structures, paleoclimate, paleomagnetism, sea-floor spreading. Plate tectonics: 12 major plates, 8 minor, plate motion causes them to collide, pull apart, scrape against, each type of interaction causes characteristic set of earth structures or tectonic features. What are they made of: rigid lithosphere. What is below: asthenosphere (more plastically, seeing the cooling) Plate movement: moved around by underlying hot mantel convection cells (currents)
