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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Section Review Restless Continents USING KEY TERMS 1.your own words, write a definition for each of the following terms: continental drift and sea-floor spreading. _______________________________________________________________ _______________________________________________________________ UNDERSTANDING KEY IDEAS _____ 2. At mid-ocean ridges, a. the crust is older. b. sea-floor spreading occurs. c. oceanic lithosphere is destroyed. d. tectonic plates are colliding. 3. Explain how oceanic lithosphere forms at mid-ocean ridges. _______________________________________________________________ _______________________________________________________________ 4. What is magnetic reversal? _______________________________________________________________ _______________________________________________________________ MATH SKILLS 5. If a piece of sea floor has moved 50 km in 5 million years, what is the yearly rate of sea-floor motion? Show your work below. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 32 Plate Tectonics Name ______________________________ Class ___________________ Date __________________ Section Review continued CRITICAL THINKING 6. Identifying Relationships Explain how magnetic reversals provide evidence for sea-floor spreading. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 7 .Applying Concepts Why do bands indicating magnetic reversals appear to be of similar width on both sides of a mid-ocean ridge? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 8 .Applying Concepts Why do you think that old rocks are rare on the ocean floor? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 33 Plate Tectonics