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Download Global Landforms - Continental Drift
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Global Landforms Continental Drift https://www.youtube.com/watch?v=KCSJNBMOjJs Scientist • Alfred Wegener • Born in 1880 in Germany • Theory of continental drift in 1912 • The mantle is the part immediately below the earth’s crust. • It is soft and rocky, but is also very hot because it is heated from below by natural radioactivity. • The heat from below, causes convection currents in the mantle – which means the plates are moved slightly. Pangaea • About 255 million years ago https://www.youtube.com/watch?v=WaUk94AdXPA Divergent • Places where plates are moving apart are called divergent boundaries. https://www.youtube.com/watch?v=2q4Yqctq6nE Seafloor spreading • Continuous process of forming new igneous rock at midocean ridges due to the magma that comes up. Convergent • Places where plates come together are called convergent boundaries. One way mountains form https://www.youtube.com/watch?v=Wt_jJUnTFhg Subduction • Subduction is when one plate slides underneath the edge of another plate. • It allows oceans to become smaller. Transform Boundaries • This is where plates slide past each other. • Earthquakes are caused by plates hitting each other, or rubbing against each other. • Volcanoes form where magna escapes through weakened points in the crust where the plates meet. https://www.youtube.com/watch?v=tIuk2blBzHs https://www.classzone.com/books/earth_science/terc/content/visualizations/es0 804/es0804page01.cfm?chapter_no=visualization
