Wegener's hypothesis that Earth's continents were joined as a single landmass, called Pangaea, that broke apart about 200mya and slowly moved to their present positions.

Ancient landmass made up of all the continents that began to break apart about 200 mya.

Imaginary line on a map that shows points of the same ag; formed at the same time.

When Earth's magnetic field changes polarity between normal and reversed.

Device used to map the ocean floor that detects small changes in magnetic fields.

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.

The hypothesis that new ocean crust is formed at mid-ocean ridges and destroyed at deepsea trenches; occurs in continuous cycle of magma intrusion and spreading.

Place where two tectonic plates are moving toward each other; is associated with trenches, island arcs, and folded mountains.

Place where two of Earth's tectonic plates are moving apart; is associated with volcanism, earthquakes, and high heat flow, and is found primarily on the seafloor.

Long, narrow depression that forms when continental crust begins to separate at a divergent boundary.

Process by which one tectonic plate slips beneath another tectonic plate.

Huge pieces of Earth's crust that cover its surface and fit together at their edges.

Place where two tectonic plates slide horizontally past each other; is characterized by long faults and shallow earthquakes.

Tectonic process associated with convecion currents in Earth's mantle that occurs when the weight of an elevated ridge pushes and oceanic plate toward a subduction zone.

Tectonic process associated with convection currents in Earth'ss mantle that occurs as the weight of the subduction plate pulls the trailing lithosphere ito a subduction zone.

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Chapter 17 Vocab ES

Vocab Words

Term	Definition
Continental Drift	Wegener's hypothesis that Earth's continents were joined as a single landmass, called Pangaea, that broke apart about 200mya and slowly moved to their present positions.
Pangaea	Ancient landmass made up of all the continents that began to break apart about 200 mya.
Isochron	Imaginary line on a map that shows points of the same ag; formed at the same time.
Magnetic reversal	When Earth's magnetic field changes polarity between normal and reversed.
Magnetometer	Device used to map the ocean floor that detects small changes in magnetic fields.
Paleomaggnetism	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.
Seafloor Spreading	The hypothesis that new ocean crust is formed at mid-ocean ridges and destroyed at deepsea trenches; occurs in continuous cycle of magma intrusion and spreading.
Convergent Boundary	Place where two tectonic plates are moving toward each other; is associated with trenches, island arcs, and folded mountains.
Divergent Boundary	Place where two of Earth's tectonic plates are moving apart; is associated with volcanism, earthquakes, and high heat flow, and is found primarily on the seafloor.
Rift Valley	Long, narrow depression that forms when continental crust begins to separate at a divergent boundary.
Subduction	Process by which one tectonic plate slips beneath another tectonic plate.
Tectonic Plate	Huge pieces of Earth's crust that cover its surface and fit together at their edges.
Transform Boundary	Place where two tectonic plates slide horizontally past each other; is characterized by long faults and shallow earthquakes.
Ridge Push	Tectonic process associated with convecion currents in Earth's mantle that occurs when the weight of an elevated ridge pushes and oceanic plate toward a subduction zone.
Slab Pull	Tectonic process associated with convection currents in Earth'ss mantle that occurs as the weight of the subduction plate pulls the trailing lithosphere ito a subduction zone.

Created by: JCrafton14

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