Layers of the Earth
Layers of Earth Pizza Style
The Moho - boundary between Crust and
Mantle
The Mohorovicic Discontinuity marks the lower limit
of Earth's crust. How did scientists find it?
The Mantle
2/3 of the Earth’s Mass (70% of the volume)
Upper Mantle has Lithosphere (solid) and Asthenosphere
pressure keeps it solid (plasticity)
The Core
Extremely Dense
1/3 Earth’s Mass (30 % Volume)
Outer Core: liquid, iron and nickel (magnetosphere)
Inner Core: Solid, Iron
Seismic Waves
• Waves Created by an
Earthquake or Explosion
• Primary (P) Waves move
through liquids, solids,
Gas
• Secondary (S) Waves
move through only solids
• Waves bend with
changes in density
The Earth’s Magnetosphere
-Created from movement
of the liquid, which
creates a electrical
current in the
outer core (iron and
nickel)
-Dipole is created (like a
magnet)
-Magnetic North and
Magnetic South are
different from
Geographic North and
Geographic South
Magnetowha?
Auroras are a result of the magnetosphere.
Shadow Zones
• Non-uniform rigidity in
material
• No S or P waves can get
through
• OR P can get through but
not S
Gravity
Mass- the amount of
matter in an object,
independent of gravity.
Weight- measure of the
strength of the pull of
gravity on an object.
Law of Gravitation- states
that the force of attraction
between any two objects
depends upon their
masses and the distance
between them.
Is your weight the same all
over Earth? Think of the
shape and your distance from
Earth at different locations.
Get out your homework in
your notes…
•You will watch the following video and explain
why these people that went to Harvard are
WRONG!!!
Video: Your from Harvard? What the….
Movements of Earth
Seasons Video- This lady is way to into this video!!!