chapter 4.2 flashcards

By wiegjac1313, Nov 2009

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plate tectonics	it describes continental movement but also proposes a possible explaination of why and how continents move. States: 1) Lithosphere broken into 30 plates 2) Plates dift ontop of convection Asthosphere
oceanic crust	the crust that lies beneath. the meterial on the ocean floor makes the oceanic crust think 5-10 km thick and dense
continental crust	the crust that lies beneath continents. also material that makes up landmasses Dense and it is 32-70 km thick (thickest under mountains)
lithosphere	thin outer shell of the earth consisting of the crust and the rigid upper mantle 65-100 km thick
asthenosphere	zone of mantle beneath the lithosphere that consists of slowly flowing solid rock 200 km thick
divergent boundary	boundary formed by two lithospheric plates that are moving apart
rift valley	steap narrow valley formed as lithospheric plates separate
convergen boundary	boarder formed by the driect collision of two lithospheric plate
subduction zone	reigion where one lithospheric plate moves under another
ocean trench	deep valley in the ocean floor that forms along the subduction zone
island arc	chain of valcanic islands formed along in ocean trench resualts when one ocean plate subducts under a ocean plate Ex: japan
transform fault boundary	boundary formed where two lithospheric plates slide past each other Ex: San Andrea's Fault
convection	transfer of heat through the movement of fluid material hot rises and cool sinks
convection current	movement in a fluid caused by uneven heating

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