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Definition
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( OUTER CORE - liquid)
( INNER CORE - solid)
metallic alloys
magnetic, generates geomagnetic field
dense, creates gravity
nickel-iron alloy |
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Term
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Definition
( continental (granitic) - alumino-silicates, quartz, 10-100km, light)
( oceanic (basaltic) - alumino-silicates & silicates, 10-15km, dense) |
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Definition
| (THICK - 2900km, iron and magnesium oxides and silicates, denser than crust) |
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| Rgeological (Mechanical) Layers |
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Definition
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Term
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Definition
- CRUST + OUTER MANTLE
- 100km thick
- rigid & strong
- made of moving sheets & plates - plate tectonics
- gets torn apart horizontally by loops due to convection (material form lower mantle rises) |
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Term
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Definition
- INNER MANTLE
- below 100km
- weak, soft, deform plastically or as highly viscous liquid putty
- very little aluminum oxide & silicate minierals
- MUCH DENSER
- high pressure
- lots of iron |
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Definition
| heat rises from asthenosphere, circulating loops moving from melted areas (rising & sinking) |
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Definition
| plates moving apart, basalt fills space between them |
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Definition
| where plates move together |
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Definition
| plates moving past one another in opposite directions - STRIKE-SLIP FAULTS (lots of earthquakes) |
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Definition
| when slow-flowing, rising currents in the Earth's asthenosphere pull apart and TEAR A PREEXISTING PLATE INTO TWO OR MORE SMALLER PLATES |
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Definition
| the process of plate growth at mid ocean ridges from erupting expanding molten material throughout the period of divergence |
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Term
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Definition
When two converging plates meet - the denser of the two plates dives beneath the other and sinks into the Earth's interior where it is consumed
Oceanic plates are denser than continental - always will dive when meeting a continental plate
Metamorphic rock formed where plates meet as rocks of higher plate are deformed |
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Term
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Definition
| when two continental plates come together neither is dense enough to subduct to the denser material below - plates weld together instead of subducting, forming a larger single plate - forming mountain ranges at border of plates |
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