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ES. Ch 17 Vocab.

Vocab.

TermDefinition
continental drift wegener developed an idea
Pangaea a greek word that means all the earth, and suggest that Pangaea began to break apart about 200 mya
magnetometer small changes in magnetic fields
magnetic reversal happens when the flow in the outer core changes, and Earth's magnetic field changes direction
paleomagnetism is the study of the history of Earth's magnetic field.
isochron is an imaginary line on a map that shows points that have 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..
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 crusts begins to separate, the stretched crust forms, a long, narrow depression
convergent boundary two tectonic plates are moving toward each other
subduction when two plates collide, the denser plate eventually descends below the other, less-dense plate in a process
transform boundary a region where two plates slide horizontally past each other
ridge push as the older portion of the sea floor sinks, the weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone in process
slab pull tectonic process associated with convection currents in Earth's mantle that occurs as the weight of the subducting plate pulls the trailing lithosphere into subduction zone.
Created by: selenamercado