Name Victor Paone 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 Atmospheric Spatial 2 What energy sources caused the interior of the early Earth to heat up The proper term is called terawatts which comes from radiogenic heat which is produced by the radioactive decay of isotopes in the mantle and crust 3 List the density stratified layers of the earth from most dense to least dense Crust mantle outer core inner core 4 The lithosphere is composed of what two layers The crust and the mantle 5 Distinguish between Earth s lithosphere and asthenosphere in terms of both location and properties The lithosphere contains the crust and the uppermost mantle which is the hard and rigid outer layer of Earth The asthenosphere is the weaker hotter and deeper part of the upper mantle which contains 6 Before people understood plate tectonics what evidence led some scientists to believe in continental drift Ages of bedrock formations which match across the Atlantic Ocean 7 What was the primary reason why Alfred Wegener s theory of continental drift rejected He could not provide a satisfactory explanation for the force that pulls and pushes the continents 8 What evidence confirmed seafloor spreading Be brief but to the point Rocks near the mid ocean ridge were younger than rocks near trenches Matching bands on rocks were changing over time Earthquake data showed oceanic crust is sinking on to the mantle at trenches 9 If the ocean floor is getting wider why is the Earth not becoming larger Old ocean floor sinks at subduction zones called trenches 10 Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end The lithosphere moves over a stable 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 Divergent spreading apart Convergent collision Transform move from side to side 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 boundary are active volcanoes generally associated The subduction zones or convergent boundaries as well as the divergent boundaries 14 How does magma form in the line of arc volcanoes over an active subduction zone Magma will slowly rise into the crust and reach the surface causing a volcanic arc 15 Along which type or types of lithospheric plate boundary are earthquakes common Convergent divergent and transform
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