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Chapter 17

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Across
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Tectonic process associated with convection currents in Earth's mantle that occurs when the weight of the subducting plate pulls the trailing lithosphere into a subduction zone
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Long, narrow depression that forms when continental crust begins to separate at a divergent boundary
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Huge pieces of Earth's crust that cover its surface and fit together at their edges
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Process by which one tectonic plate slips beneath another tectonic plate
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Device used to map the ocean floor that detects small changes in magnetic fields
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Study of Earth's magnetic record using data gathered from iron-bearing minerals in rocks that have recorded the orientation of Earth's magnetic field at the time of their formation
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Place where two tectonic plates are moving toward each other; is associated with trenches, island arcs, and folded mountains
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Ancient landmass made up of all the continents that began to break apart about 200 mya
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Place where two tectonic plates are moving apart; is associated with volcanism, earthquakes, and high heat flow, and is found primarily on the seafloor
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Tectonic process associated with convection currents in Earth's mantle that occurs when the weight of an elevated ridge pushes an oceanic plate toward a subduction zone
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Wegener's hypothesis that Earth's continents were joined as a single land mass, called Pangaea, that broke apart about 200 mya and slowly moved to their present posisitons
Down
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Imaginary line on a map that shows points of the same age; formed at the same time
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When Earth's magnetic field changes polarity between normal and reversed
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Place where two tectonic plates slide horizontally past each other; is characterized by long faults and shallow earthquakes
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The hypothesis that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea tranches; occurs in a continuous cycle of magma intrusion and spreading