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14 Cards in this Set
- Front
- Back
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Continental drift |
Large scale movements of continents |
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The origins of continents and oceans by wegener |
Back (Definition) |
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Sea floor spreading |
Convection in earth's mantle could push and pull continents apart creating new oceanic crust |
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Different plate boundaries |
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Mid-ocean ridge |
Undersea mountain chain that exhibits earthquakes volcanism and rifting caused by tensional forces of mantle convection that pull the two plates apart |
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Spreading center |
Part of divergent boundaries |
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Island arc |
Chain of volcanoes |
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Magnetic anomalies |
Intensify of the magnetic field alternated between high and low values in long narrow parallel bands |
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Magnetic time scale |
Measurements over hundreds of places around the world reveals the direction of earth's magnetic field at the time when that layer is cooled |
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Relative plate velocity |
Velocity at which one plate moves relative to the other |
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Geodesy |
Measuring the shape of earth and locating points on its surface |
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Isochrons |
Contours of equal seafloor age Measures amount of spreading |
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Rodinia |
Formed 1.1 billion years ago Before Pangea Died 750 million |
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Mantle plume |
Type of jet like upwelling |
