Name Steven Zamora 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 The forces that drive internal and external Earth Processes is that internal processes such as magma formation to create volcanoes the storage of strain energy in rock to create earthquakes driven by heat loss from Earth s deep interior 2 What energy sources caused the interior of the early Earth to heat up The energy sources that causes the interior of the early Earth to heat up is gravitational collapse impact energy and radioactive decay 3 List the density stratified layers of the earth from most dense to least dense The density stratified layers of the Earth from most dense to least dense is the Inner Core Outer Core Mantle Oceanic Crust and Continental Crust 4 The lithosphere is composed of what two layers The lithosphere is composed of two layers which is Earth s Crust upper mantle 5 Distinguish between Earth s lithosphere and asthenosphere in terms of both location and properties The difference between the Earth s lithosphere and asthenosphere is Earth s lithosphere is composed of the crust the upper part of the mantle and is rigid brittle behaves elastically while the asthenosphere is the part of the mantle directly below which acts like plastic and has a solid that flows 6 Before people understood plate tectonics what evidence led some scientists to believe in continental drift The evidence that led some scientists to believe in continental drift is match of coastlines across the Atlantic ocean match of rock formations across the Atlantic Ocean distribution of fossil species across continents and distribution of climate sensitive sedimentary rocks 7 What was the primary reason why Alfred Wegener s theory of continental drift rejected The primary reason why Alfred Wegener s theory of continental drift was rejected because he had no viable mechanism for moving continental crust 8 What evidence confirmed seafloor spreading Be brief but to the point The evidence that confirmed seafloor spreading was the reversals of Earth s magnetic field are preserved in ocean floor basalt as matching symmetrical striped patterns parallel to the mid ocean ridge 9 If the ocean floor is getting wider why is the Earth not becoming larger The Earth is not becoming larger because old ocean floor sinks at subduction zones 10 Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end Many oceanic volcanoes occur as long lines of volcanoes that are active at only one end because they are hotspot volcanoes 11 What are the main types of lithospheric plate boundaries in terms of relative motions Provide a real example of each The main types of lithospheric plate boundaries in terms of relative motions are Continental Ocean Convergent Plate Boundary which an example is Andes Mountains in South America and the Cascade Mountains in Western US Ocean Ocean Convergent Plate Boundary which an example is the Japan Aleutian islands Caribbean Islands and Mariana Islands and Continent Continent Divergent Boundary which an example is the breakup of Pangea and the East African Rift Valley Basin Range of Nevada Utah 12 Why does oceanic lithosphere almost always sink beneath continental lithosphere at convergent plate boundaries The Oceanic Lithosphere almost always sink beneath the continental lithosphere at convergent plate boundaries because oceanic lithosphere is denser heavier than continental lithosphere 13 With which type or types of boundary are active volcanoes generally associated The types of boundaries that have active volcanoes generally associated are divergent and convergent boundaries 14 How does magma form in the line of arc volcanoes over an active subduction zone Manga forms in the line of arc volcanoes over an active subduction zone by melting of the subduction oceanic plates 15 Along which type or types of lithospheric plate boundary are earthquakes common The types of lithospheric plates boundaries that earthquakes are common are convergent divergent and transform boundaries
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