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Topic:
Inferred Properties of
Earth’s Interior
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Crust
Mantle
Outer CoreInner
Core
Simple Model of Earth’s
Interior
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ESRT page 10
***All Interior info is
based on: Studying
Seismic (earthquake)
waves
*** the outer core is a
liquid!!!!
Melting point is lower
than temperature
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The Crust
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Mantle
Thic
ke
r
Thin
ne
r
Felsic &
mostly
granite
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Thicker
Thinner
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Continental Crust vs. Oceanic Crust
Continental: Oceanic:
-Thick -Thin
-Felsic -Mafic
-Lower density -Higher density
-Mostly Granite -Mostly Basalt
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What is the Moho?
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MOHO-Mohorovicic Discontinuity:
boundary between crust & mantle
Andriji Mohorovicic.1909
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Density
Increasing
Depth
Increasing
Density
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What section of crust is shown in the diagram?
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What is the Lithosphere?
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Lithosphere
- crust & rigid mantle
- divided into sections “plates”
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What is the Asthenosphere?
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Asthenosphere
Partially melted layer of mantle
Convection moves lithospheric plates
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Mid-Atlantic Ridge in Iceland (J. Parkinson)
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Over the Mid-Atlantic RidgeTo North
America
To Europe
J. ParkinsonMid-Ocean Ridge Video Clip
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Diverging Plates
Fill in on ESRT New ocean
crust created
Old crust
destroyed
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Converging Plates
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What is the Mantle?
Thickest
layer of
the
Earth
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What is the Outer Core?
Outer
Core
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What is the Inner Core?
Inner
Core
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Earth’s Core is:
Similar to meteorites
Origin of Earth’s magnetic field – iron & nickel magnetic elements
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ESRT pg 10
More on the Interior
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Surface of Earth
Center of Earth
Radius of Earth = 6378 KM
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Sample Question:
1. What is the depth of the outer and inner core boundary?
5100 km (remember units!!!)
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Represents the Pressure at different depths
2. What is the pressure at the mantle and outer core boundary?
1.5 million atm.
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Line represents the temperatures inside the Earth
3. What is the temperature at the lithosphere and asthenosphere boundary?
1000°C
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4. Which layer(s) of Earth is in the liquid phase?
Outer Core
Solid
SolidSolid Liquid
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FQ:
Which type of crust is the densest?
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