Plate tectonics
Trench-the leading edge where an oceanic plate begins to subduct <br />
divergent zone- where seafloor spreading occurs; new crust forms
Island arc- a line of volcanoes along an oceanic-oceanic subduction zone
volcanic mountain range- created by a subducting plate melting, this range parallels the trench; example: Andes Mountains
Transform boundary- plates slide against each other, producing earthquakes
friction causes melting of the overlying plate; less dense, the magma moves upward to create volcanoes
magma from below moves up to fill in the rift zone opening above
Convection occurs in the lower mantle. Hitting the asthenosphere above, the rising magma plume spreads apart, pulling at the soft rock, creating a diverging zone.
Lower Mantle- made of thick magma; convection here powers the tectonic plate movement above
asthenosphere- hot rock, but not melted; soft, can be bent, stretched (note: should be shown as a separate layer below lithosphere)
Lithosphere- hard, solid rock, along with crust (above) makes up tectonic plates
oceanic crust- thin, dense, young
Continental crust- least dense layer of rock; &quot;floats&quot; on top of Earth&apos;s layers, making it the oldest layer. Allows more dense oceanic crust to subduct.
The Wilson Cycle shows how a rift zone on land becomes a seafloor spreading zone; eventually the sea closes up and mountains form. A short animation about how a continent splits up into a continental rift valley and later into an open ocean by sea floor spreding, and finally the closure ...
shallow earthquakes
intermediate depth earthquakes
deep earthquakes
shallow earthquakes
sediment build-up at continent&apos;s edge gets dragged into subduction zone, leading to pressure build-up and tsunamis This replaces previous subduction animation. In this animation, we are showing an ocean/continent convergent boundary. We see the denser...
Mr. Comerford&apos;s plate boundary rap TOUCH this image to discover its story. Image tagging powered by ThingLink

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