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12 Cards in this Set
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explain convectional current in plate movement |
- core gives out intense heat causing semimolten rock in the mantle to expand, become less dense and rise - it rises to the crust and two covectional currents spread out , pulling plates apart, forming divergent plate boundaries - when the current cools sinks n contracts it drives the crusts back tgt forming convergent plate boundaries |
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slab pull force |
the sinking oceanic plate at the subduction zone pulls the rest of the plate behind it the subduction causes a downward movement portion of the convectional currents mantle material drives upward portion of the convectional currents |
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divergent plate (cc) 🌋🏜 |
-2 C plates move apart - form fractures - crust is pulled apart , land between fractures sink to form linear depression - rift valley - at points of rift valley, magma builds up n solidifies to form volcano |
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eg? |
nubian n somalian plate boundary at the african plate diverge -> east african rift valley |
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divergent (oo) |
- oo plates move apart - fractures form at boundary - magma rises from mantle - new sea floor forms - sea floor spreading : lava flows out of fracture to cool n solidify - mid oceanic ridge forms - new rocks formed r close to middle while old r further - at mid oceanic ridge , magma builds up n solidifies forming under volcanoes, when they rise above sea level they r volcanic islands |
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eg |
mid atlantic ridge north american plate + eurasian plate |
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oo convergent |
- oceanic converge with oceanic plate (move towards) - denser subduct under less dense -there will be a depression in sea floor called oceanic trench -at point of subduction mantle material above melts to form magma which rises above crust - forming volcanoes |
pacific converge w philippine forming mariana trench |
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continental x2 convergence |
- 2 CC move towards eo n collide n push against eo - dense n buoyant - resist subduction -plates slide along fractures -compressional forces cause layers of rocks to buckle n fold . - fold mountains |
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eg |
himalayas eurasian n indian |
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oc convergence |
-denser oceanic subducts beneath less dense continental - subduction zone: oceanic trench -continental plate: fold mountains & volcanoes - magma below crust rises to surface to solidify |
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oc convergence |
-denser oceanic subducts beneath less dense continental - subduction zone: oceanic trench -continental plate: fold mountains & volcanoes - magma below crust rises to surface to solidify |
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eg |
barisan mountains n sunda trench ( australian & eurasian ) |
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