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18 Cards in this Set
- Front
- Back
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plate tectonics |
Earth's surface is made of rigid slabs of rock, or plates, that move with respect to each other |
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lithosphere |
cold and rigid outermost rock layer |
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Asthenosphere |
layer of the Earth below the lithosphere |
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Divergent boundary |
forms where 2 plates separate |
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Transform boundary |
forms where two plates slide past each other |
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Convergent boundary |
form where two plates collide |
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Subduction |
plate collision where the denser plate sinks below the more buoyant plate |
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convection |
circulation of material caused by differences in temperature and density |
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Seafloor spreading |
the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge |
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Pangaea |
supercontinent comprised of all the other continents |
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mid-ocean ridge |
mountain ranges in the middle of the ocean |
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continental drift |
Slow moving of continents over the Earth's surfaceis called |
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Sonar |
device which bounces sound waves off of things andthen records the echos of the sound. |
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deep-ocean trenches |
deep under watercanyons |
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plates |
carry the continents, parts of a continent, the oceanfloor. Form "jigsaw" like puzzle across Earth's surface |
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rift valley |
large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems. |
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continent |
one of several very large landmasses on Earth. |
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convection current |
a current in a fluid that results from convection. |
