Download - Ch 17 Review
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Ch 17 Review
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• What 5 similarities on either side of the Atlantic Ocean provided evidence for continental drift?–Coastal Shapes–Rock Formations–Fossils–Ancient Climates–Glaciation
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• If coal is found in a place that is now a cold, dry wasteland… what does that suggest?
• The climate of the area had changed… it was once more temperate and rainy
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• The newest part of the ocean floor is found near what?
• Mid-ocean ridges
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• What happens to plates at a transform boundary?
• They slide past one another
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• What transfers thermal energy within the mantle?
• Convection currents
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• The downward part of the convection current pulls plates…
• Towards one another
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Early Observations
• As early as the 1500s, mapmakers noticed what about the continents?
• Matching coastlines
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• Why was the continental drift hypothesis not widely accepted at first?
• The movement of the continents
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• Compared to oceanic crust near deep sea trenches, the age of the crust near the mid-ocean ridges is?
• younger
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• Compared to the crust near the mid-ocean ridges, the sediment deposits on the crust near the deep sea trenches?
• Is thicker
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• The magnetic pattern on oceanic crust near a mid-ocean ridge is
• Symmetrically striped
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• Each cycle of spreading and intrusion of magma at ocean ridges results in what?
• Formation of new crust
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• Rift valleys are found at what type of plate boundary?
• divergent
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• What process results in the formation of a deep sea trench?
• subduction
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• Continental-continental collisions produce what?
• Very tall mountain ranges
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• Oceanic-continental collisions produce what?
• Volcanic mountain ranges
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• Oceanic-oceanic collisions produce what?
• Island arcs
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• Crust is neither destroyed nor formed at which type of plate boundary?
• transform
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• Convection currents that drive the movement of tectonic plates are located where?
• The mantle
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• Wegener’s hypothesis that the world’s landmasses were once joined was called what?
• Continental drift
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• The study of the earth’s magnetic record is known as what?
• Paleomagnetism
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• A map line connecting points that have the same age are called what?
• isochrons
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• Plate boundary where plates slide past each other…
• transform
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• Plate boundary where plates move apart
• Divergent boundary
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• Process whereby the weight of an uplifted ocean ridge pushes an oceanic plate towards a subduction zone.
• Ridge push
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• Process whereby the weight of a subducting plate pulls the underlying lithosphere into the deep-sea trench.
• Slab pull
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• Process where one plate descends beneath another?
• Subduction
• Not SEDUCTION--- those would be naughty plates =)
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• Type of boundary where 2 plates come together
• convergent
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• A change in the earth’s magnetic field is called a what?
• Magnetic reversal
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• A landmass thought to have been comprised of all present-day continents was called what?
• pangaea
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• A device that measures changes in earth’s magnetic field.
• magnetometer
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• A device that uses sound to map the ocean floor
• sonar
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• Deepest place on earth
• Marianas trench
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• Theory that states that earth’s crust is broken into enormous slabs
• Plate tectonics
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• the mechanism associated with plate movements
• convection
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• Deep scratches found on rocks is evidence of what?
• glaciers.
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• Where is the trench located?
• D
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• Where is the ocean ridge located?
• E
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• Where is subduction occurring?
• D
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• Where is the newest rock located near?
• E
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• Where is slab pull occurring?
• C
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• Where is ridge push occurring?
• B
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• Where is the convection current?
• A