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8 Cards in this Set
- Front
- Back
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theory of plate tectonics
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*lithospherie-made of oceanic crust, continental crust, & upper mantle; made of plates that move on the asthenosphere
*asthenosphere-dense under layer of plastic rock that flows under pressure |
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lithospheric plate boundaries
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*divergent-plates move apart at mid-ocean ridges as asthenosphere moves up to form rift valley
*convergent-plates collide into each other from opposite directions *oceanic crust collides w/continental crust *oceanic is denser & is subducted along subduction zone; forms deep ocean trench; partial melting of magma forms volcanic mtns. *2 continental crust come together *crumple & uplift to form lrg. mtn. ranges(Himalayas) *2 oceanic crusts come together *subduction & trench;form island acrs *transform-plates scrape as they move past each other; San Andreas fault in CA |
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how crust is deformed
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*deformation may be bending, tilting, or breaking crust
*Isostatic Adjustment *up & down movement of crust to reach isostasy(balance of crustal weights) *stress *compression(push together) *tension(pull apart) *shearing(push opposite horizontal directions) |
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results of stress(folding)
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*response to stress w/o breaking
*anticline *upcurve;oldest rock in middle *forms ridge *syncline *downcurve;youngest rock in middle *forms valley *monocline *fold w/2 horizontal limbs |
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results of stress(faulting)
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*response to stress by breaking
*fracture-break w/no movement *fault-break w/movement along fault plane *hanging wall above fault plane *footwall below |
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fault types
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*normal fault- hanging wall moves down
*reverse fault- hanging wall moves up *thrust fault-reverse fault plane nearly horizontal *strike-slip fault-horizontal; found along transform boundary |
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mountain formation
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*elevation part of earth's crust
*mountain range *group w/similar shape & structure *mountain system *appalachians-Great Smoky, Blue Ridge, Cumberland, Green * mountaion belt *circum-Pacific *eurasian-melanesian |
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mountain types
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*folded
*where continents collided *highest ranges *appalachians, Himalayas *fault-block *where crust extended & broke into large blocks *Sierra Nevadas *volcanic *molten rock erupts on land or ocean floor *Cascadas, Hawaiian Islands *dome *molten rock that doesn't break surface *Black Hills,SD; Adirondack,NY |
