Layers of the Earth

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Layers of the Earth
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Composition (What it is made of)

• Inner Core
• Outer Core
• Mantle
• Crust

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The Inner Core

• Solid ball due to high pressure (most dense
  layer)
• 1540 miles across
• 3700C VERY HOT!
• Iron and nickel
• Intense pressure keeps it
• from liquefying

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The Outer Core

• Dense liquid molten rock
• 1400 miles thick
• Mainly iron and nickel
• Some silicon
• Between mantle and inner core
• Gives Earth its magnetic field

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The Mantle

• Parts are semi-molten (silly putty)
• 1800 miles thick
• Mantle rock is more dense than crustal rock
• Flows in sluggish currents
• Between crust and outer core

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The Crust

• Earths outer rocky surface
• 4 miles thick under oceans
• Up to 40 miles thick under mountain
  ranges
• Consists of mostly light rocks
• (granite below continents)
• (basalt below oceans)
• Oceans cover 71 of the crust (very dense)
• Continental (less dense)
  
• 
  add on notes

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Oceanic and Continental Crust
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Tectonic Plates

• Earths crust is broken into about 19 pieces
• These plates move on top of the asthenosphere

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Earths Layers

• How are the Earths layers similar to an egg?

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Earths Layers

• How are the Earths layers similar to an egg?
• Shellcrust
• Egg whitemantle
• Yolkcore , inner outer core

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Other Physical Structures of the Earths Layers

• Lithosphere- includes the crust and the upper
  most portion of the asthenosphere.
• This area glides over the rest of the upper
• mantle. Zone of earthquakes/volcanoes.
• Asthenosphere- top layer of the upper mantle
  which consists of highly viscous rock that flows
  slowly (like hot asphalt)