Earth structure for S2
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Unit 1A Anatomy of the Earth
Transcript of Earth structure for S2
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Unit 1AAnatomy of the Earth
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•1 in 5
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Core
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1000 miles an hour
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Core Inner Core:
Solid
Up to 4700 C
Iron, Nickel
Dense
Outer Core
Molten iron
3500-4000C
Dense
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Mantle• Silicates and Magnesium Oxide
• Dense
• 1000-3500 C (hotter towards the core)
• Mostly solid, but rocks flow under pressure-viscous
• Giant convection currents carry heat from the core to the crust, ...
• ..and return cooler material towards core
• Thin layer of near-molten rock near crust
• Moho is the boundary between crust and mantle
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Oceanic or Continental Crust?Of the two,
• Which is thicker?
• Which is more dense?
• Which is older?
• Which has greater complexity of rock types?
• Which gets recycled?
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The Crust
• “ A brittle, fractured,
• thin, solid layer”
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Crust