GEOL 101 Lecture Notes - Lecture 10: Laurasia, Continental Drift, Convergent Boundary
Document Summary
Evidence for continental drift, south america and africa. Patterns of glacial movement: mountain ranges on the seafloor, theory of continental drift, alfred wegener. Study of the origin and the arrangement of structural features of the earth"s crust: glaciers normally move from land to ocean, sea floor. Rocks along mid-ocean ridges are young: once people started mapping the topography of the sea floor they found the network of high mountains running through most of the world"s oceans, they connect throughout the world"s oceans. New rocks move up from the mantle at a mid-ocean ridge. Pillow lavas explode from the seas floor due to high pressure: rift valleys on land (east africa, runs through iceland, convergent boundary: tectonic plates move towards each other. Subduction: one plate is pushed beneath another and moves down into the mantle. Ocean plate and continental plate: mountain range, deep ocean trench, earthquakes, volcanoes, arc of volcanic islands (older plate will subduct)
