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Earth Layers
Density
• Density = mass/volume
• Heating an object causes it’s molecules to
spread out causing it’s volume to change.
• Examples liquid, solid, gas phases
• Door key
• Marbles in bag
Viscosity
• A material’s
Resistance to flow.
• How can viscosity be
changed.
• 1. Adding Heat
• 2. Adding Water
• This will become
extremely important
when studying
volcanoes.
Earth’s Layers
•
What three things increase the closer to
the center of the Earth (core) we go?
– Density (Composition, what matter it is
made up of), temperature ( It gets Hotter!!!)
and pressure.
What are the three main layers of the Earth?
- Core, Mantle and Crust
The Crust
• Made up of Silicates.
(Very light material)
• Averages around 40
km in thickness.
• The Earth’s crust is
like the shell of an
egg, very thin!
The Mantle
• Composed of mostly silicates, but is also
rich in iron and magnesium which makes it
more dense than the crust.
• The Mantle has 3 parts
– Lithosphere (100km thick)
– Asthenosphere (100km thick)
– Mesosphere (2650km thick!)
The Core
• Extremely Hot center of the Earth! 5500 C
• Two parts
– Outer Core (liquid iron) 2,250km
– Inner Core (Solid iron due to high pressure)
– 1,300km
Earth Cross Section Drawing
• Drawing must include:
-All layers
-Crust, Mantle (lithospere, asthenosphere,and
mesosphere.) Outer and Inner Core.
-Each Layer must be clearly labeled with a title,
the thickness of the layer and the composition of
the layer.
- Neatness will be taken into consideration when
being graded!
Drawing will be worth 25 points. Use notes!!!!!