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4 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Internal structure of earth |
Inner core Outer core Lower mantle Asthenosphere Uppermost mantle Crust |
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Why tectonic plates move? |
-Convection current+Slab pull force -Mantle material gain heat,expand and becomes less dense, rising -Spreads out beneath plates causing them to move apart -Cools and sinks,pulling plates along -Sinking mantle material heated up once again and cycle repeats itself. |
What causes it and how does it affect the plates? |
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Type of plate movements |
DIVERGENCE O-O C-C
Convergence C-C O-O O-C |
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Divergence (O-O) |
-2 oceanic plates diverge -Magma rises to fill the gap,cooling down and solidifying to form seafloor -Called seafloor spreading -Newer rock formed nearer to plate boundaries whereas older rock are further from plate boundary -As magma builds up above surrounding land a mid oceanic ridge is formed. -Undersea volcanoes form along mid oceanic ridge. If above sea level they form volcanic islands. |
What forms when they diverge? How does it form? |
