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Chapter 17 Vocab KW

Earth Science

QuestionAnswer
Proposed that Earth's continents had once been joined as a single landmass that broke apart and sent the continents adrift. Continental Drift
A Greek word that means all the earth, and suggested that this began to break apart about 200 mya. Pangaea
A device that can detect small changes in magnetic fields. Magnetometer
Happens when the flow in the outer core changes, and Earth's magnetic field changes direction. Magnetic Reversal
The study of the history of Earth's magnetic field. Paleomagnitism
An imaginary line on a map that shows points that have the same age. Isochron
The theory that explains how new ocean crust is formed at ocean ridges. Seafloor Spreading
Huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth's surface. Tectonic Plates
A long, narrow depression formed from stretched continental crust. Rift Valley
Two tectonic plates are moving toward each other. Convergent Boundaries
When two plates collide, the denser plate eventually descends below the other, less-dense plate. Subduction
A region where two plates slide horizontally past each other. Transform Boundary
The weight of the uplifted ridge is though to push the oceanic plate toward the trench formed at the subduction zone. Ridge Push
The weight of a subducting plate pulls the trailing slab into the subduction zone much like a tablecloth slipping off the table can pull articles off with it. Slab Pull
Created by: Katelyn Whitlock
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