Name: ____Angel Barkley___________________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?The forces that drive the internal earth processes are geological. While the forcesthat drive the external earth processes are solar, spatial, and atmospheric.2. What energy sources caused the interior of the early Earth to heat up?The energy sources that cause the interior of the early Earth to heat up are impact energy, ongoing decay of radioactive isotopes, and gravitational energy.3. List the density stratified layers of the earth from most dense to least dense.The list from most to least dense are inner core, outer core, mantle, then crust.4. The lithosphere is composed of what two layers?The lithosphere is composed of the upper mantle and the crust.5. Distinguish between Earth’s lithosphere and asthenosphere in terms of both location and properties.The lithosphere is rigid while the asthenosphere is soft. The lithosphere is located at the crust and the upper most portion of the mantle and the asthenosphere is in the upper portion of the Earth’s mantle. 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 was ages of bedrock formations match across the Atlantic Ocean.7. What was the primary reason why Alfred Wegener’s theory of continental drift rejected?The main reason Wegener’s theory of the continental drift being rejected was because he suggested no explanation for the movement of the continents. He explained that the force of the Earths spin caused the continents to move but geologists know the rocks were too strong for this to be true. 8. What evidence confirmed seafloor spreading? Be brief but to the point There is tons of evidence to confirm the seafloor spreading, some of them being eruptions of molten material, the ages of the rocks, and the magnetic stripes in the rocks on the ocean floor. 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 ends up sinking into subduction zones or trenches. 10. Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end? 11. What are the main types of lithospheric plate boundaries in terms of relative motions? Provide a real example of each.The types of lithospheric plate boundaries are divergent(Mid-Atlantic Ridge), convergent(Andes Mountains), and transform(San Andreas Fault).12. Why does oceanic lithosphere almost always sink beneath continental lithosphere at convergent plate boundaries? The oceanic lithosphere sinks beneath the continental lithosphere because the continental lithosphere is considered lighter and more buoyant because it floats on top of magma. 13. With which type or types of boundary are active volcanoes generally associated?The types of boundaries usually associated with active volcanoes are convergent plate and subduction zone boundaries. 14. How does magma form in the line of arc volcanoes over an active subduction zone?Volcanic arcs occur because of the result of subduction of oceanic plates lowering the melting point of the mantle. When the plate is subducted to creates a huge amount of pressure that causes the mantle to melt and create magma under the plate. The magma forms an arc of volcanoes. 15. Along which type or types of lithospheric plate boundary are earthquakes common?Earthquakes are common among convergent, divergent and transform plate