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World Geography 3200 / 3202: Unit 1 – Plate Tectonics Name:____________________ In this lesson you will: 1.1.1 Explain how compressional forces are caused. (k) 1.1.2 Explain how tensional forces are caused. (k) 1.1.3 Relate selected plate movements to compressional and tensional forces. (a) Explaining Compressional and Tensional tectonic Forces: Tectonic plates move or float on top of the asthenosphere. 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. 1. Explain and draw each of the following terms: Term Definition COMPRESSIONAL FORCES SUBDUCTION ZONES TENSIONAL FORCES RIDGE ZONES READING A TECTONIC PLATES MAP: Notice that subduction zones occur where the tectonic plates are moving towards each other while Ridge zones occur where the plates are moving apart. Notice that the Americas (North American Plate and South American Plate) are moving away from Europe and Africa (Eurasian Plate and African Plate. Visual THE DEVELOPMENT OF “THE THEOTY OF CONTINENTAL DRIFT” Use the information on the CDLI website, to answer the questions below. 2. _____________________________ proposed the theory of Continental Drift. 3. What did he propose? _________________________________________________________________________ _____________________________________________________________________________________________ 4. What evidence did he have? ___________________________________________________________________ _____________________________________________________________________________________________ _____________________________________________________________________________________________ 5. What flaws did the theory have? _________________________________________________________________ ______________________________________________________________________________________________ 6. What Canadian scientist solidified the theory of Continental Drift? ______________________________________ 7. Explain CONTINENTAL DRIFT. ____________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ 8. On the map below, draw and label the major tectonic plates on Earth.
