GLY 1880 Topic 1

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The primary reason continental drift theory was initially (prior to 1968) rejected was
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A failure to explain how continental crust could move though ocean crust
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This feature is where the North America Plate is sliding laterally past the Pacific Plate (transform plate boundary)
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San Andreas Fault
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__________ is viewed as the developer of the theory of continental drift
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Wegener
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According to the theory of plate tectonics, old oceanic crust is destroyed
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in deep oceanic trenches
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As young seafloor moves away from a spreading ridge
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it cools and contracts, so the seafloor slopes down and away from the ridges
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_________ is the name of the supercontinent of the late Paleozoic-Mesozoic comprising all of the present continents before breaking up
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Pangaea
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The magnetic stripes (anomalies) of the seafloor
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all of these are true
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What is the study of Earth’s magnetic history called
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Paleomagnetism
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__________ was comprised of South America, Africa, Madagascar, India, Australia and Anatartica
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Gondwana
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The discovery of these features from the ocean basins was the key to the seafloor spreading hypothesis and unlocking the secrets of plate tectonics
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magnetic anomalies
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________ refers to the force imparted on a tectonic plate by the gravity-driven subduction of a cold dense slab of lithosphere surronded by warmer asthenosphere, thus pulling the rest of the plate along as it descends into the asethenosphere
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slab-pull
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A __________ plate boundary is a zone along which plates slide past one another and crust is neither produced nor destroyed
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transform fault plate
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Sediment thickness decrease away from the Mid-Atlantic Ridge and reaches minimum thickness along the adjacent continental margins
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False
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Oceanic _______ are the deepest regions of the ocean basins
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trenches
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A _________ is where new crust is created as plates move apart
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divergent plate boundary
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The __________ is the rigid outer later from the earth’s surface down to the asthenoshpere
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lithosphere
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Which of the following is flase about oceanic ridges such as the Mid-Atlantic ridge
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they have the thickest accumulations of oceanic sediment
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Major zones of earthquakes occur near trenches where a zone of dipping shallow, intermediate, and deep earthquakes defines a _____ zone of seismicity
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Benioff Zone
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Continental landmasses merged into this single landmass prior to the evolution of dinosaurs
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Pangaea
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A __________ continental margin is one away that is not near a plate margin
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passive
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The Himalayan Mts. and Tibetan Plateau were formed by collision of the
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Indian and Asian plates
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The eastern boundary of the North American Plate is
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the Mid-Atlantic Ridge
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Which of the following is NOT a former portion of Gondwana landmass
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Europe
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Plate tectonics is driven by
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mantle convection, slab pull and ridge push
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Earthquakes and volcanoes are more common around the Pacific than the Atlantic because of the subduction of lithosphere into trenches
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True

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