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Study Guide: Chapter 8 – Plate Tectonics Circle or Underline the correct choice At which boundary type are hydrothermal vents located? - Divergent, collision or transform __________ is the gravitational sliding of rock away from a mid-ocean ridge. – mantle convection, slab pull or ridge push Plates move apart in this type of boundary. – subduction, divergent or transform Belts where earthquakes and volcanoes occur are __________. – cratons, terranes or plate boundaries The San Andreas Fault is this type of boundary. – convergent, divergent, or transform What is the name of the “super continent”? – Eurasia, Gondwana or Pangaea Where will you find the oldest rock in the area of the mid-Atlantic ridge? - farthest from the ridge - in the rift valley - at the ridge’s base Cool, sinking convection currents will cause plates to __________. – come together, move apart, or slide What will form when two continental plates converge? Mountains, trenches, or volcanoes Which area will contain the youngest rock samples? North American craton, deep ocean, or mid-Atlantic ridge Segments of rift valleys are called __________. Chasms, subduction platforms, or fracture zones What is an area that is bounded on all sides by major faults? Craton, fracture zone, terrane What theory came before plate tectonic theory? continental divide, continental drift, or oceanic thrust The lithosphere is composed of the Earth’s….. crust, mantle, & a portion of the outer core crust & upper mantle crust only What events occur at all plate boundaries? deep-sea trenches, earthquakes, volcanoes Who collected evidence and proposed a theory about plate movement in 1912? Hutton, Kepler, Ortelius, or Wegener What is ancient rock that serves as the core of a continent? Craton, fracture zone, terrane What type of boundary will form between an oceanic and a continental plate? Collision, subduction, or transform Which is an example of continental growth through river sediments? alluvial fan, delta, or terrane What feature runs through the center of a mid-ocean ridge? deep-sea trench, plasma trough, or rift valley True or False T or F Continental rocks are less dense than oceanic rocks. T or F Hot, rising currents will push tectonic plates apart. T or F During periods of reverse polarity, south is the positive magnetic pole. T or F Mid-ocean ridges mark the location of plate boundaries. T or F Plutons are intrusions of igneous rock that enlarge continents. Label the formations according to the boundary where they are located. C = Collision D = Divergent S = Subduction T = Transform ______ Spreading centers ______ One plate dives beneath another ______ Appalachian mountains ______ Plates slide horizontally ______ Mid-Indian ridge ______ Volcanic island chain ______ Puerto Rican trench ______ Plates crash together ______ Plates move apart What evidence supports the theory of continental drift? What fact could not be explained by the theory of continental drift? There are two types of tectonic plates. Name each and identify the main rock of each type. What early fossils provided evidence of plate movement?
