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Chapter 17-Plate Tectonics

Horizontales
Supercontinent
Huge pieces of crust and rigid upper mantle
Long, narrow depression
Region where two plates slide horizontally past each other
Two tectonic plates are moving toward each other
Device that can detect small changes in magnetic fields
The weight of the uplifted ridge is thought to push the oceanic plate toward the trench
When the flow in the outer core changes and Earth's magnetic field changes directions
An imaginary line on a map that shows points that are the same age
Verticales
Study of the history of Earth's magnetic fields
Proposed that Earth's continents had once been joined as a single landmass that broke apart and drifted
Regions where two tectonic plates move apart
Theory that explains how new oceanic crust is formed
When two plates collide, the denser plate descends below the less-dense plate
Weight of a relatively cool, dense subducting plate pulls the trailing slab into the subduction zone