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| Layer below Lithosphere. Lacks strength or rigidity. Helps concept of continental drift become possible. Plastic layer (tooth paste) |
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| Easily ruptured. Occurs near-surface conditions with faults and fractures. |
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| Stress that squeezes or compresses the object. |
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| Wegener proposed Pangaea split apart and continents drifted to present place. |
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| Slowly churning in the plastic asthenosphere. Due to heating and cooling of the asthenosphere. Drags the overlying lithosphere with it. |
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| Convergent Plate Boundary |
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| Lithospheric plates are moving toward each other. |
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| The temperature, if a mineral is below, can remain magnetic, but above the temperature the mineral loses its magnetic properties. |
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| Lithospheric plates move apart. |
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| A material that can undergo extensive plastic deformation without breaking. |
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| Deformation occurs but material returns to its original size and shape when the stress is removed. |
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| The maximum amount of elasticity within a material with out going through plastic deformation. |
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| Isolated areas of volcanic activity usually not associated with plate boundaries. |
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| Created from plate movement with a hot spot. |
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| Outer solid layer of the earth. Made up of the earths crust and upper mantle, is some-what brittle and elastic. |
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| Fossil magnetism in rocks. Reveals the stripes of reversed magnetisms on sea floor. |
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| Small stresses yield large corresponding strains, and the changes are permanent. |
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| Relates tectonics to the existence and movement of rigid "Plates" over a weaker, more plastic layer in the earth's upper mantle. |
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| The resulting curve showing the apparent movement of the magnetic pole relative to the continent as a function of time. |
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| The moving apart of lithospheric plates at the ocean ridges. |
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| Stress that causes different parts of an object to move in different directions across a plane or to slide pass one another. |
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| Deformation resulting from stress. |
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| Occurs when force is applied to an object. |
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| Boundary where one plate is carried down below another. |
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| The study of large-scale movement and deformation of the earth's outer layers. |
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| Stress that pulls the object apart. |
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| A break in the lithosphere where opposite sides of the fault belong to two different plates and move in opposite directions. (Sand Andreas Fault) |
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