Chapter 8 Plate Tectonics
Chapter 8 Plate Tectonics
Chapter 8 Plate Tectonics
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220 CHAPTER 8: PLATE TECTONICS<br />
14. In which diagram do the arrows best represent the motion of Earth’s crust<br />
at the Peru-Chile Trench?<br />
15. Which observation provides the best evidence for the pattern of crustal<br />
movement at the Peru-Chile Trench?<br />
(1) the direction of flow of warm ocean currents<br />
(2) the mineral composition of samples of mafic mantle rock<br />
(3) comparison of the rates of sediment deposition<br />
(4) the locations of shallow focus and deep focus earthquakes<br />
Open-Ended Questions<br />
16. What evidence indicates that lithospheric plates move over Earth’s surface.<br />
17. How is energy moved from one place to another in heat flow by convection?<br />
18. Earthquakes are not evenly distributed over Earth. Why are earthquakes<br />
common along the west coast of the continental United States?<br />
19. How can plates move apart at the mid-ocean ridges and not leave a deep<br />
gap in the lithosphere?<br />
20. Classify each of the plate boundaries listed below as divergent, convergent,<br />
or transform.<br />
(a) East Pacific Ridge<br />
(b) Aleutian Trench<br />
(c) Western side of South American <strong>Plate</strong><br />
(d) San Andreas Fault
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