Quakes & Plates


1. According to the Earth Science Reference Tables, which zone of the Earth has the greatest density?




2. According to the Earth Science Reference Tables, for the last 200 million years, continents on opposite sides of the Atlantic Ocean have

generally



3. A seismographic station records a travel time difference of 3 minutes between P-waves and S-waves of an earthquake. Approximately how far is the seismic station from the epicenter of the earth-quake?




4. The temperature of the rock located 1000 kilometers below the Earth's surface is about




5. The composition of some meteorites supports the inference that the Earth's core is composed of




6. Igneous rock along mid-ocean ridges is younger than the igneous rock farther from the ridges. This evidence supports the theory that




7. At which location would seismic measurements indicate that the Earth's crust is thickest?




8. The time that an earthquake occurred can be inferred by knowing the




9. Why do geologists infer that the Earth's outer core is a liquid?




10. At what type of plate boundary would the fault shown in the diagram be found?






11. Which statement best describes the continental and oceanic crusts?




12. Most of the world's volcanoes are located in




13. What earth features are represented by the gray areas in the diagram?






14. Our present understanding of the nature of the Earth's interior is based primarily upon information obtained from




15. Useful information regarding the composition of the interior of the Earth can be derived from earthquakes because earthquake waves




16. According to the plate tectonic theory




17. The actual point along a fault where slippage occurs and causes an earthquake is called a (an)




18. At equal depths in the Earth, S-waves travel




19. What kind of boundary is shown in the diagram?





20. At which location in the diagram would the age of the sea-floor be greatest?






21. The sea floor rock at location B is approximately 80 million years old. At which other location could rock of similar age be found?






22. According to the Earth Science Reference Tables, if a seismograph station records a difference in arrival times between P-waves and S-waves of 4 minutes, how far away is the epicenter of the Earthquake?




23. Using the Richter scale of earthquake magnitude, each higher number represents how many more times as much energy than the preceding number?




24. Which evidence does NOT support the theory that Africa and South America were once part of the same large continent?




25. A state of balance may exist between continents and ocean basins. Any upset of this balance may cause the crust to move and readjust. The term most closely associated with this statement is




26. Where do most earthquakes occur?




27. The time lapse between the arrival of P-waves and S-waves at one seismograph recording station can be used to determine the




28. The term isostasy refers to a




29. As the distance between an observer and an earthquake decreases, the difference in arrival times of P and S waves



30. Igneous materials found along ocean ridges contain magnetic iron particles that show reversal of magnetic orientation. This is evidence that




31. The density of the Earth's core would be most nearly the same as the density of




32. Based on the Reference Tables, about how far away from the receiving station is the epicenter of an earthquake if the difference in arrival times of P-waves and S-waves is six minutes and thirty seconds?




33. An earthquake occurred at 5:00:00 A.M. At what time would the P-wave reach a seismic station 3000 kilometers from the epicenter?




34. The oceanic crust is thought to be composed mainly of




35. At what depth below the surface of the Earth is the temperature higher than the melting point of the rocks found at that depth?




36. What is the pressure at the boundary between the mantle and the outer core?




37. According to the Earth Science Reference Tables, the temperature of the rock at a depth of 6000 Km. in the Earth is lower than the melting point of those rocks. This would indicate that




38. The epicenter of an earthquake is located near Massena, New York. According to the Earth Science Reference Tables, the greatest difference in arrival times of P-waves and S-waves for this earthquake would be recorded in




39. According to the Earth Science Reference Tables, what is the relationship between density, temperature, and pressure inside the Earth as depth increases?




40. Compared to the continental crust of North America, the oceanic crust in the area of the Hawaiian Islands is probably




41. Which event provides direct evidence of crustal movement?




42. Which statement about the Earth's mantle is best supported by data given in the Earth Science Reference Tables?




43. An abrupt change in the speed of seismic waves is an indication that the




44. It takes P waves 4 minutes to travel from the epicenter of an earthquake to a seismic station. How long will it take S waves from the same earthquake to reach that seismic station?




45. At which location in the diagram is new sea floor probably being created?






46. Which location in the diagram represents a region where sea floor is being subducted?






47. According to the Earth Science Reference Tables, approximately how far will a P-wave travel in eight minutes?




48. Following an earthquake, a seismograph station recorded the arrival of a P-waveat 3:09:30 a.m. and an S-wave at 3:14:00a.m. According to the Earth Science Reference tables, what is the distance from the seismic station to the epicenter of the earthquake




49. A seismograph station determines that its distance from the epicenter of an earthquake is 4000 kilometers. According to the Reference Tables, if the P-wave arrived at the station at 10:15 a.m., the time of the earthquakes's origin was




50. Two samples of ocean floor basaltic bedrock are found at equal distances from, and on opposite sides of, a mid-ocean ridge. The best evidence that both samples were formed at the ridge at the same time is that both samples also




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