GEOL 201 Chapter Notes - Chapter 2: Lithosphere, Fracture Zone, Outer Core

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Lodestone component in compass realizations of earth"s magnetic eld. Mechanism: circulation of liquid iron alloy in the outer core of the earth generates a magnetic eld. Apparent polar-wander path a path on the globe along which a magnetic pole appears to have wandered over time; in fact, the continents drift, while the magnetic pole stays fairly xed a proof for continental movement. Mid-ocean ridge a 2-km-high submarine mountain belt that forms along a divergent oceanic plate boundary, includes abyssal plain. Fracture zone a narrow band of vertical fractures in the ocean oor; fracture zones lie roughly at right angles to a mid-ocean ridge, and the actively slipping part of a fracture zone is a transform fault. Trench a deep, elongate trough bordering a volcanic arc; a trench de nes the trace of a convergent plate boundary. Volcanic arc a curving chain of active volcanoes formed adjacent to a convergent plate boundary.

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