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14 Cards in this Set

  • Front
  • Back
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)
thin outer shell of the earth consisting of the crust and the rigid upper mantle 65-100 km thick
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
transfer of heat through the movement of fluid material hot rises and cool sinks
convection current
movement in a fluid caused by uneven heating