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Transcript
Earth Science Chapter 17 Worksheet 1 Name ____________________________ Block ____________________________ Match the definitions to the correct word or term ____ 1. Convergent boundaries A. The process that occurs when the weight of a subducting plate helps pull the trailing lithospheric plate into the subduction zone ____ 2. Pangaea ____ 3. Magnetic reversal ____ 4. Tectonic plate ____ 5. Seafloor spreading B. The study of Earth’s magnetic record using data from rocks containing iron-bearing minerals that have recorded the orientation of Earth’s magnetic field C. The process where one tectonic the plates descends beneath another D. Lines on a map that connect points that have the same age E. Ancient landmass made up of all the continents that began to break apart about 200 million years ago ____ 6. Subduction F. A hypothesis which proposed that Earth’s continents had once been joined as a single landmass ____ ____ ____ 7. Rift valley 8. Slab pull 9. Paleomagnetism ____ 10. Transform boundary G. A place where two plates slide horizontally past each other H. Changes in Earth’s magnetic field over geologic time I. The process that occurs when the weight of the uplifted ridge pushes an oceanic plate toward the trench formed at the subduction zone J. A device that can detect small changes in magnetic fields ____ 11. Divergent boundaries ____ 12. Continental drift ____ 13. Isochron ____ 14. Ridge push ____ 15. Magnetometer K. Places where two tectonic plates are moving toward each other L. Places where two tectonic plates are moving apart M. The theory that states that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches N. Long, narrow depression that forms when continental crust begins to separate at a divergent boundary O. Huge pieces of Earth’s crust that cover its surface and fit together at their edges Circle the letter that corresponds to the correct answer 16. What was Wegener’s hypothesis called? a. Seafloor spreading b. Plate tectonics c. Continental drift d. Slab pull 17. The fit of the coastlines of which of the following continents led people to suggest that the continents drifted apart a. North and South America b. North America and Africa c. South America and Africa d. Europe and North America 18. Which of the following evidence was used by Wegener to support his hypothesis that the continents had once been joined? a. Rock types and ages b. Plate tectonics c. Slab pull and ridge push d. Fossil of ocean plants 19. Which of the following was not used by Wegener to support his hypothesis of continental drift? a. Fossils of land-dwelling animals b. Paleomagnetic data c. Coal beds in Antarctica d. Glacial deposits 20. Why was the hypothesis of continental drift rejected when it was proposed by Wegener? a. Wegener thought that the south pole had changed positions b. Wegener thought that Earth’s rotation was the driving force c. Wegener couldn’t explain how or why continents moved d. Wegener died in Greenland in 1930 21. Many early mapmakers thought Earth’s continents had moved based on a. Plate boundary locations b. Fossil evidence c. Climatic data d. Matching coastlines 22. Compared to ocean crust near deep-sea trenches, crust near ocean ridges is a. Younger b. Older c. The same age d. Magnetically reversed 23. Each cycle of spreading and intrusion of magma during seafloor spreading results in a. Magnetic reversals b. New ocean crust c. Subduction d. Plates colliding 24. Features found at divergent boundaries include a. Ocean ridges b. Deep-sea trenches c. Crumpled mountains d. Island arc islands 25. Subduction results in the formation of a. A deep-sea trench b. A magnetic reversal c. A rift valley d. New continental crust 26. Continental-continental plate collisions produce a. Island arcs b. Rift valleys c. Deep-sea trenches d. Very tall mountain ranges 27. Crust is neither destroyed nor formed along which of the following boundaries? a. Convergent b. Divergent c. Transform d. Magnetic 28. The driving force of tectonic plates are related to convection currents in Earth’s a. Crust b. Mantle c. Inner core d. Outer core Fill in the blanks with the appropriate term from the answer bank Continental drift Magnetic reversal Divergent boundaries Transform boundaries Magnetometer Seafloor spreading Rift valley Convection Paleomagnetism Theory of plate tectonics Convergent boundaries Subduction Pangaea Isochron Slab pull Ridge push 29. ________________________ is a process that occurs at convergent boundaries 30. Wegener’s hypothesis of _______________________ stated that Earth’s continents had once been joined as a single landmass 31. The study of Earth’s magnetic record is known as __________________________ 32. A map line connecting points that have the same age is a(n) __________________________ 33. The _____________________________ states that Earth’s crust and rigid upper mantle are broken into enormous slabs called plates that move slowly over Earth’s surface 34. ____________________ are places where plates slide horizontally past each other 35. _____________________ is a process whereby the weight of an uplifted ocean ridge pushes an oceanic plate toward a subduction zone 36. The transfer of thermal energy by the movement of heated matter is __________________ 37. Places where plates move apart are ___________________________ 38. _________________ occurs when one tectonic plate descends beneath another 39. Earth’s continents were once joined as a single landmass called ___________________ 40. A(n) ___________________ detects small changes in Earth’s magnetic field 41. The theory of ________________________ explains how new ocean crust is created at ocean ridges and destroyed in deep-sea trenches 42. Plates come together at ________________________________ 43. A long, narrow, fault-bounded, continental depression is a(n) ______________________ 44. A change in Earth’s magnetic field is called a(n) _____________________________ Answer the following questions 45. What early evidence suggested that Earth’s continents might be moving? 46. How did Alfred Wegener use rock and fossil evidence to support his hypothesis? 47. How do ocean ridges and deep-sea trenches support the theory of seafloor spreading? 48. Explain what happens at the three types of plate boundaries 49. What are the relationships among mantle convection, ocean ridges, and subduction zones?