proposed that Earth's continents had once been joined as a single landmass that broke apart and sent the continents adrift.

a greek word that means all the earth.

a device that can detect small changes in magnetic fields.

happens when the flow in the outer core changes, and Earth's magnetic field changes direction.

the study of the history of earth's magnetic field.

an imaginary line on a map that shows points that have the same age

the theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches

huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth's surface

regions where two tectonic plates are moving apart

when continental crust begins to separate the stretched crust forms a long narrow depression

convergent boundaries

two tectonic plates are moving toward each other

when two plates collide, the denser plate eventually descends below the other, less- dense plate

a region where two plates slide horizontally past each other

as the older portion of the seafloor sinks, the weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone

the weight of a subduction plate pulls the trailing slab into the subduction zone much like a tablecloth slipping off the can pull articles off with it.

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chapter 17 es vocab

Term	Definition
continental drift	proposed that Earth's continents had once been joined as a single landmass that broke apart and sent the continents adrift.
pangaea	a greek word that means all the earth.
magnetometer	a device that can detect small changes in magnetic fields.
magnetica reversal	happens when the flow in the outer core changes, and Earth's magnetic field changes direction.
Paleomagnetism	the study of the history of earth's magnetic field.
isochron	an imaginary line on a map that shows points that have the same age
seafloor spreading	the theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches
tectonic plates	huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth's surface
divergent boundaries	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 boundaries	two tectonic plates are moving toward each other
subduction	when two 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	as the older portion of the seafloor sinks, the weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone
slab pull	the weight of a subduction plate pulls the trailing slab into the subduction zone much like a tablecloth slipping off the can pull articles off with it.

Created by: Kamishepard_14

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