Layers of the Earth

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Layers of the Earth
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Essential QuestionHow are the layers of the
Earth different?
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Crust (1)

• Solid, rocky outer layer
• Averages 32 km thick (5-40 km)

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Two types of crust

• Continental (granite)
• - Thicker
• Oceanic (basalt)
• - Thinner

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Mountains made of granite
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Basalt
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Mantle (2)

• Hot rock
• About 3000 km thick
• Made of silicon, oxygen, iron, magnesium
• 870 C

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Core (3)

• Center of the Earth
• Made of metal

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Lithosphere (4)

• Includes crust top solid portion of mantle
• Floats on asthenosphere

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Asthenosphere (5)

• Liquid portion of the mantle
• Slowly moves
• Convection Currents occur here

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The rest of the mantle is solid, and is
sometimes called the Mesosphere (6).
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Outer Core (7)

• About 2,250 km thick
• Made of iron and nickel
• Liquid, slowly rotates
• 2,200 C

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Inner Core (8)

• About 1,200 km thick
• Made of iron and nickel
• Solid due to pressure
• 5,000 C

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Vocab for this section

• Heat Transfer
• Crust
• Mantle
• Core
• Lithosphere
• Asthenosphere

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Assignment

• Write a letter to Mr. Morret that answers the
  essential question.
• Your letter MUST list each of the 8 layers we
  talked about
• You MUST include at least one fact about each
  layer in the letter
• You MUST ask one question relating to the layers
  in your letter