Name: ____________Learning Unit 2: Plate Tectonics and Physical Hazards Review QuestionsThis 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 - GeologicalExternal- Solar, Spacial2. What energy sources caused the interior of the early Earth to heat up?1. Gravitational collapse 2. Impact Energy3. Radioactive decay3. List the density stratified layers of the earth from most dense to least dense.Inner coreOuter coreMantleOceanic crustContinental crust4. The lithosphere is composed of what two layers? The upper mantle and crust.5. Distinguish between Earth’s lithosphere and asthenosphere in terms of both location and properties. Lithosphere - above asthenosphere (crust and upper mantle) behaves rigid, brittle , elastically Asthenosphere - below lithosphere (mantle below lithosphere)behaves like a plastic, a solid that flows6. Before people understood plate tectonics, what evidence led some scientists to believe in continental drift? Continents fit together like a puzzle. Fossils of plants and animals of the same species found on different continents. The distribution of climate sensitive sedimentary rocks on the different continents.Glacial sediment deposits found in places where glaciers do not exist today. Glacial scratches line up like a jigsaw puzzle when continents are reassembled.7. What was the primary reason why Alfred Wegener’s theory of continental drift rejected?He never supplies a viable mechanism to explain how continental movement could be accomplished.8. What evidence confirmed seafloor spreading? Be brief but to the point Alternating normal and reversely polarized rock form a symmetrical stripe-like pattern parallel to the ridge crest.9. If the ocean floor is getting wider, why is the Earth not becoming larger? The denser oceanic plate will SUBDUCT beneath that of the lower density continental plate.10.Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end? The lithosphere moves over a hotspot in the mantle.11.What are the main types of lithospheric plate boundaries in terms of relative motions?Provide a real example of each. Convergent Plate Boundary- collides (Himalayas)Divergent Plate Boundary- spreads apart (Mid-Atlantic Ridge)Transform Plate Boundary- slides past (San Andreas Fault)12.Why does oceanic lithosphere almost always sink beneath continental lithosphere at convergent plate boundaries? Oceanic lithosphere is more dense than continental lithosphere.13.With which type or types of boundary 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?The magma, being less dense than the surrounding solid mantle, rises up through the continental (felsic) crust.15.Along which type or types of lithospheric plate boundary are earthquakes common?All lithospheric plate
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