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Plate Tectonics Plate Theory Mountain Building Folds & Faults General Plate Qs Miscellaneous 100 100 100 100 100 100 200 200 200 200 200 200 300 300 300 300 300 300 400 400 400 400 400 400 500 500 500 500 500 500 Plate Boundaries Alfred Wegener is responsible for what theory relating to Plate Tectonics? Continental Drift What specifically does the term Pangaea mean? All Lands If new crust is being created at the mid-ocean ridges, why isn’t the earth getting larger? It is being destroyed (recycled) in subduction zones What invention of the early 1900‘s helped geologist Harry Hess come up with his idea of sea-floor spreading? Sonar How do magnetic stripes in ocean floor rock provide evidence of sea-floor spreading? Stripes are the recorded reversals of Earth’s magnetic poles in rocks The lithosphere is destroyed at These (2x) plate boundaries? (be specific) Oceanic-Oceanic, Oceanic-Continental What is the driving force behind the movement of the lithospheric plates? Convection Currents What are three physical features that can be produced at a convergent boundary? Trenches, Mountains, Volcanoes As plates move apart at a divergent boundary what is created between the plates? Rift valley Why aren’t volcanoes produced at a continental-continental plate boundary? No subduction The type of stress that produces earthquakes but not mountains? Shear Compressional stress without subduction will produce what? (2 things) mountains and earthquakes What type of plate boundary formed the Andes mountains? (be specific) OceanicContinental Mountains along a divergent boundary would be made from what type of rock? Igneous Rock Being in the middle of a plate, explain how the volcanic islands of Hawaii were formed. Hot Spot in the mantle Stress resulting from the squeezing together of rock. Compressional Found between the footwall and hanging wall. Fault Plane Fault in which the hanging wall moves up in relation to footwall. Reverse Fault Fold or bend of rocks in which they have created a downward bulge. Syncline Stress that would create a fault-block mountain. Tensional Stress What type of fault is shown below? Thrust Fault Term describing what happens when one plate goes under another. Subduction The San Andreas fault lies along what type of boundary? Name the two plates on either side of the fault. Transform: Pacific and N. American Plates What type of fault is created when the hanging wall moves down in relation to the footwall? Normal Name one piece of evidence that supports Hess and his theory of sea-floor spreading. Age of ocean rocks, Magnetic stripes, earthquake foci The change in shape and structure of rock is due to what? Deformation (Stress) Most volcanoes are found near what other geologic feature? Trenches Why didn’t the scientific community believe Alfred Wegener’s theory of continental drift? No mechanism for movement How is a dome mountain formed? Uplifting of land from magma How did Alfred Wegener use glacier evidence to support his theory of Continental Drift? Glaciers move outward toward the ocean; this is only possible if continents formed one large massive continent (Pangea) Plate Tectonics Plate Theory Plate Boundaries Mountain Building Folds & Faults General Plate Qs Miscellaneous Final Jeopardy What do the letters in the word “Sonar” stand for? Sound Navigation and Ranging 33