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Chapter 17 ES

TermDefinition
Continental drift which proposed that Earth's continents had once been joined as a single landmass that broke apart and sent the continents adrift.
Pangea is a supercontinent
magnetometer used to study the ocean floor
magnetic reversal happens when the flow in the outer core changes and earth's magnetic field changes directions
paleomagnetism is the study of the history of Earth's magnetic field
isochron is an imaginary line on a map that show points that have the same age that is they formed at the same time.
seafloor spreading is the theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep sea trenches during seafloor spreading magma which is hotter and less dense than surrounding mantle material.
tectonic plate are huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth's Surface
divergent boundary Regions where two tectonic plates are moving apart
rift valley when continental crust begins to separate the stretched crust forms a long narrow depression
convergent boundary two tectonic plates are moving toward each other.
subduction When to plates collide the denser plate eventually descends below the other less dense plate.
transform boundary A region where two plates slide horizontally past each other.
ridge push The weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone
slab pull the movement weight of a subduction plate pulls the trailing slab into the subduction zone.
Created by: garrettreed
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