Dynamic Earth

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Dynamic Earth
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Outline

1. Earths Interior
2. Plate Tectonics
3. Plate Boundaries
4. Earthquakes
5. Volcanoes

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I. Earths Interior

1. Crust
2. Mantle
3. Core
4. Temperature

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Earths InteriorA. Crust

• Outer most layer of earth
• Oceanic crust
• Dense basalt
• Thin (4-6 km thick)
• Continental crust
• Less dense granite
• Thick (20-60 km thick) but even thicker at
  mountains

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Earths InteriorA. Crust

• Isostacy less dense continental crust floats
  within oceanic crust even though it has more mass

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Earths InteriorB. Mantle

• 2900 km deep never drilled into it
• Hot iron, rich in silicates
• Outer mantle
• Thinner (350 km)
• Solid

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Earths InteriorB. Mantle

• Inner mantle
• Thickest part of mantle (2550 km)
• Plasticy melted rock

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Earths InteriorC. Core

• Mostly Iron and nickel
• Above 3000 degrees Celsius
• Metals melt at 1500 degrees Celsius

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Earths InteriorC. Core

• Outer Core
• Liquid (2,000 km)
• Inner Core
• Solid due to intense pressure (2,800 km)

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Earths InteriorD. Temperature

• Temperature is a result of radioactive decay
• Uranium, Potassium, Thorium