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World Geo 3200/02 Unit 1 : LESSON 2 A Review from last day……. The Structure of the Earth & Continental Drift Structure of the Earth’s Surface Topography is a general term referring to the surface features of the earth like, hills, mountains, valleys, plains, plateaus and other relief features. Structure of the Earth’s Surface Structure of the Earth’s Surface Structure of the Earth’s Surface Structure of the Earth’s Surface Structure of the Earth’s Surface Structure of the Earth’s Surface Review Observing the elevation profile below which province would be least likely to have extensive plains? Review Imagine you flew from the west coast of South America to the east coast and you flew right along the equator. What land forms would you fly over? How Landforms Change: Plate Tectonics p.10 This section introduces you to Alfred Wegener and J. Tuzo Wilson Main idea Evidence Flaws (if any) Video Link Plate Tectonics Tectonic plates move or float on top of the asthenosphere (orange in the figure). However they do not float freely. The plates are forced in specific directions by the flow of magma beneath. Just like a boat caught in a current plates move with the flow of magma. The magma forms convectional currents. The magma closer to the core heats and then rises towards the surface as its density decreases. Once the rising magma reaches the lithosphere it moves in opposite directions. Plate Tectonics Plate Tectonics Plate Tectonics Plate Tectonics Compressional Forces occur where two tectonic plates come together. They compress against each other. Subduction Zones sometimes occur where compressional forces result from two plates colliding. Tensional Forces occur where two tectonic plates are pushed apart. The tension is created as the plates move away from each other. Ridge Zones sometimes occur where two plates move apart. The magma rises between the plates and forms a ridge. Compressional Forces occur where two tectonic plates come together. They compress against each other. Subduction Zones sometimes occur where compressional forces result from two plates colliding.