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18 Cards in this Set
- Front
- Back
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Pangaea |
A supercontinent |
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Continental drift |
A proposition that earths continents had once been joined as a single landmass then broke apart. |
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Magnetometer |
A device that can detect small changes in the magnetic fields |
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Magnetic reversal |
This happens when the flow in the outer core changes and earths magnetic field changes direction |
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Paleomagnetism |
The study of the history of earth's magnetic field |
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Isochron |
An imaginary line on a map that shows points that have the same age |
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Seafloor spreading |
The theory that explains how new ocean crust is formed at the ridges and destroyed at the trenches |
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Tectonic plates |
Huge pieces of crust and rigid upper mantle that fit together and cover earths surface |
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Divergent boundaries |
Regions where two tectonic plates are moving apart |
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Rift Valley |
When continents begin to separate, then forms a long narrow depression |
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Convergent boundaries |
Two tectonic plates moving toward each other |
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Subduction |
When a less denser plate goes below the other |
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Transform boundary |
When two plates slide horizontally past each other |
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Ridge push |
As older part of the sea floor sinks the weight of the uplifted ridge pushes through the oceanic plate towards the trench formed at the subduction zone |
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Ridge push |
As older part of the sea floor sinks the weight of the uplifted ridge pushes through the oceanic plate towards the trench formed at the subduction zone |
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Slab pull |
When The weight of the subducting plate pulls the trailing slab into the subducting zone |
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Ridge push |
As older part of the sea floor sinks the weight of the uplifted ridge pushes through the oceanic plate towards the trench formed at the subduction zone |
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Slab pull |
When The weight of the subducting plate pulls the trailing slab into the subducting zone |
