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Dynamic Earth Interactive Activity Explore through the website http://www.learner.org/interactives/dynamicearth to answer the following questions --- this is linked for you on my web page! 1. How many miles thick is the mantle? ________________ Is the mantle considered to be made of liquid? (yes?/no?). (Explain)___________ _________________________________________________________________. 2. The inner core is made mostly of ____________ and is found __________ miles to _____________miles below the surface and is about ____________ in diameter. 3. What is the Earth’s only liquid layer? ____________________________ 4. Is the crust the thickest under the ocean or under the continents? __________________ 5. In the plate tectonics module, which picture looks more like the earth today? (right or left) 6. Click on “How do we know this?” - What did Pangaea split into 200 million years ago? ____________________________ 7. The lithosphere is broken up into several large slabs called __________. They are ____________ moving. Approximately how fast do plates move per year? ________________ ***Click on the Plate Boundaries Module: 8. How many major tectonic plates are there? _____________ 9. Which type of crust is thinner (oceanic or continental)? Which of these is usually oldest? ____________________________ 10. How does each plate get its name? ___________________________________________ 11. What is the border between two tectonic plates called? ____________________________ Click on the “Slip, Slide, & Collide” Module: Read the first page then continue!! 12. Describe what happens at each type of convergent plate boundary: oceanic-continental: _______________________________________________ Geological Activity: ______________________ continental-continental:_____________________________________________ Geological Activity:________________________ oceanic-oceanic: __________________________________________________ Geological Activity: _________________________ 13. Match the words with the correct definition: ______Volcano A. Rigid outer layer broken up by tectonic plates ______Asthenosphere B. the area where one plate is being pulled under the edge of another ______Continental crust C. the tectonic plates float on top of this ______Trench D. steep-sided depression in the sea floor ______Subduction Zone E. chain of volcanoes ______Oceanic Crust F. earth’s crust that makes up the continents ______Lithosphere G. a vent in the earth’s surface in which magma and gases erupt ______Volcanic arc H. Earth’s crust found underneath the oceans 14. What is an island arc? 15. Why do two plates of continental crust collide instead of subduct? 16. Divergent boundaries in the middle of the ocean contribute to _________________. What is a rift? 17. At a transform boundary why do earthquakes commonly occur? _____________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 18. What is the best-studied strike-slip fault and where is it located? _____________________ ***Complete the Plate Interactions Challenge. Finally, complete the last module: “Test Skills” Record your score________. SHOW ME YOUR SCORE IF YOU FINISH IN CLASS. IF YOU FINISH AT HOME, PRINT OUT THE FIRST SHEET SHOWING YOUR FINAL SCORE.