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

ancient landmas smade up of all the contents that began to break apart about 200 mys.

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

when earth's magnetic field changes polarity from normal to reversed

study of earth's magnetic record using data gathered from iron-bearing minerals in rock s that have recorded the orientation of earth's magnetic fields at the time of their formation.

imaginary line on a map that shows points of the same age formed at the same time

the hypothesis that new ocean crust is formed at mid-ocean ridges and destroys at deep-sea trenches occurs in a continuous cycle of magma institution and spreading.

huge pieces of earth's crust that cover it surface and fit together at their edges.

Place where two of Earth's tectonic plates ate moving apart is associated with volcanic 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 voundary

convergent boundaries

place where two tectonic plates are moving toward each other is associated with trench s islands arcs and folded mountains

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

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

tectonic process associated with convection currents in earth's mantle that occurs when the weight of an elevated ridge pushes an oceanic plate toward a subjection zone.

tectonic process associated with convection current in earth's mantle that occurs as the weight of the subduction plate pulls the trailing lithosphere into a subduction zone.

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Chapter 17 Voab

Section 1-4

Question	Answer
Continental drift	Wegener's hypothesis that Earth's continents were joined as a single landmass, called Pangaea, that broke apart about 200 mya and slowly moved to their present positions.
pangaea	ancient landmas smade up of all the contents that began to break apart about 200 mys.
Magnetometer	device used to map the ocean floor that detects small changes in magnetic fields.
Magnetic reversal	when earth's magnetic field changes polarity from normal to reversed
Palcomagnetism	study of earth's magnetic record using data gathered from iron-bearing minerals in rock s that have recorded the orientation of earth's magnetic fields at the time of their formation.
isochron	imaginary line on a map that shows points of the same age formed at the same time
seafloor spreading	the hypothesis that new ocean crust is formed at mid-ocean ridges and destroys at deep-sea trenches occurs in a continuous cycle of magma institution and spreading.
tectonic plates	huge pieces of earth's crust that cover it surface and fit together at their edges.
divergent boundaries	Place where two of Earth's tectonic plates ate moving apart is associated with volcanic 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 voundary
convergent boundaries	place where two tectonic plates are moving toward each other is associated with trench s islands arcs and folded mountains
subduction	process by which one tectonic plate slips beneath another tectonic plate.
transform boundary	Place where two tectonic plates slide horizontally past each another is characterized by long faults and shallow earthquakes.
ridge push	tectonic process associated with convection currents in earth's mantle that occurs when the weight of an elevated ridge pushes an oceanic plate toward a subjection zone.
slab pull	tectonic process associated with convection current in earth's mantle that occurs as the weight of the subduction plate pulls the trailing lithosphere into a subduction zone.

Created by: AshleyandJesus

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