Plate Tectonics

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created 11 years ago by lduhart
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Plate tectonics

Theory that the lithosphere is divided into tectonic plates that move around on top of the asthenosphere; the motions of tectonic plates.

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Continental drift

the theory that continents can drift apart from one another and have done so in the past.

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Tectonic Plates

huge pieces of the lithosphere that move around on top of the asthenosphere; consist of the crust and the rigid, uppermost part of the mantle.

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Sea-floor spreading

The process by which new oceanic lithosphere forms at the mid-ocean ridge

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Convergent boundary

the boundary between two colliding tectonic plates

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Divergent boundary

the boundary between two tectonics plates that are moving away from each other

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Transform boundary

boundary between two tectonic plates that are sliding past each other

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Pangaea

all earth; super-continent that existed almost 245 million years ago

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fault

is a type of strain that occurs when rock break because of stress

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Folding

is a type of strain that occurs when rock bend because of stress

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Earthquake

when stress builds up and is released to cause seismic waves to vibrate and shake

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Stress

the amount of force per unit area that is put on a rock

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strain

any change in a rocks shape volume caused by stress; deformation

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Mid- Ocean ridge

is the combination of all the Earth's mid-ocean ridges

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Uplift

the rising of regions of Earth's crust to higher elevations

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subsidence

the sinking of regions of Earth's crust to lower elevations

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Subduction

the region where oceanic lithosphere sinks down into the asthenosphere at a convergent boundary

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Polarity

the direction of a magnetic field

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Oceanic Crust

crust that is thin and made of relatively dense materials

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Continental crust

crust that is thick and made of relatively light weight materials