Name Learning Unit 2 Plate Tectonics and Physical Hazards Review Questions This assignment is designed to assess your understanding of Unit 2 and includes some of the Questions for Review at the end of Chapter 2 from your text plus a few additional questions Each question can be answered in one to two sentences Please limit yourself to a maximum of three sentences Access the assignment complete it with ANSWERS IN A DIFFERENT COLOR FONT as a separate file and send it back for evaluation and grading through the assignment tab by or before the due date 1 What forces drive internal and external Earth Processes Internal Geological External Solar Atmosphere 2 What energy sources caused the interior of the early Earth to heat up Impact energy Gravitational energy Decay of radioactive Isotopes 3 List the density stratified layers of the earth from most dense to least dense The inner core outer core the mantle crust 4 The lithosphere is composed of what two layers The crust and outer mantle 5 Distinguish between Earth s lithosphere and asthenosphere in terms of both location and properties The crust and mantle make the lithosphere Although the asthenosphere is solid it can also flow The Asthenosphere sits on the lithosphere 6 Before people understood plate tectonics what evidence led some scientists to believe in continental drift The bedrock formations across the Atlantic Ocean 7 What was the primary reason why Alfred Wegener s theory of continental drift rejected Because many scientists could show that his theory was not physically possible 8 What evidence confirmed seafloor spreading Be brief but to the point It was in the mid 1960s from work on magnetic properties of the ocean floor rocks Mid ocean ridges created the new crust If the ocean floor is getting wider why is the Earth not becoming larger 9 This is because of seafloor spreading As the crust spreads out from the ridge the older crust sinks into the ocean trenches 10 Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end It is because of the movement of the lithospheric plate over an ocean hotspot 11 What are the main types of lithospheric plate boundaries in terms of relative motions Provide a real example of each Convergent come together The Himalayas Divergent separating Mid oceanic ridge Transform sliding past San Andreas Fault 12 Why does oceanic lithosphere almost always sink beneath continental lithosphere at convergent plate boundaries Because it is denser 13 With which type or types of boundaries are active volcanoes generally associated Divergent and convergent boundaries 14 How does magma form in the line of arc volcanoes over an active subduction zone Water rises into the overlying mantle which it somewhat melts to make the basalt magma rise Magma rises to the crust which forms a volcanic arc 15 Along which type or types of lithospheric plate boundary are earthquakes common Earthquakes are common in the convergent and transform boundaries
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