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16 Cards in this Set
- Front
- Back
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a process that occurs at convergent plate boundaries where the denser plate sinks below a more buoyant plate |
subduction |
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name of the super continent proposed by Alfred Wegener |
Pangaea |
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the theory that Earth's surface is made of rigid slabs of rocks, or plates, that move with respect towards eachother |
plate tectonics |
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a plate boundary that forms when two plates collide |
convergent plate boundary |
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A state in which magnetized objects, such as compass needles, will orient themselves to point north |
normal polarity |
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a plate boundary that forms when two plates slide past eachother |
transform plate boundary |
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occurs when magnetic field changes direction |
magnetic reversal |
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the cold and most rigid outer layer of Earth |
lithosphere |
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a state in which magnetized objects would reverse direction and orient themselves to point south |
reversed polarity |
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the circulation of material caused by differences in temperature and density |
convection |
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a force that pulls on the plate when the cold, denser plate sinks |
slab pull |
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the mountain range in the middle of the oceans |
mid-ocean ridges |
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the hypothesis that suggested that continents are in constant motion on the surface of the Earth |
continental drift |
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the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge |
seafloor spreading |
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a plate boundary where two plates separate |
divergent plate boundary |
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the force that moves the lithosphere in opposite directions away from the mid-ocean ridge |
ridge push |
