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Transcript
______________________________________ ______________________________________ ______________________________________ ______________________________________ READING GUIDE 7-2: RESTLESS CONTINENTS (PAGES198 – 201) WEGENER’S CONTINENTAL DRIFT HYPOTHESIS 1. The hypothesis by Alfred Wegener that explains why continents seem to fit together is called ________________________________________. 2. According to Wegener, how many landmasses did all continents once form? ______ 3.______What did Wegener hypothesize happened to the continents? a. They broke up and re-formed. b. They drifted together to form a single continent. c. They broke up and drifted to their current locations. d. They sank into the ocean. 4. Explain how fossil evidence supports Wegener’s theory. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 5. List three kinds of evidence found on both sides of the ocean that support Wegener’s theory. a. _____________________________________________________________ b. _____________________________________________________________ c. _____________________________________________________________ THE BREAKUP OF PANGAEA 6. Wegener thought that all of the present continents were once joined 245 million years ago in a landmass he called __________________. 7. About 180 million years ago the single landmass split into two huge continents. What did Wegener call them? _____________________________ _____________________________ 8. When the above two continents split 65 million years ago, what were formed? ________________________________ SEA-FLOOR SPREADING 9. Many scientists rejected Wegener’s hypothesis because they didn’t see how the rock of the crust can move the way it does. In the process of sea-floor spreading, what happens when magma rises to Earth’s surface and solidifies? _______________________________________________________________ _______________________________________________________________ Match the correct definition with the correct term. _____ 10. process of forming new oceanic lithosphere as magma rises to the surface _____ 11. areas where sea-floor spreading takes place a. continental drift b. mid-ocean ridges c. sea-floor spreading d. magnetic reversal _____ 12. process that happens when Earth’s magnetic poles change place _____ 13. theory that explains how continents reached their current locations