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How is a Twix bar like the Earth?
3 Compositional LayersC.M.C.
<1% Earth’s mass
67% Earth’s mass
33% Earth’s mass
Crust
Continental Crust• 30-50 km thick• Less dense• Silicon, aluminum
Oceanic Crust• 10 km thick• More dense• Iron, magnesium,
basalt
Mantle
• A lot of Magnesium• A little silicon and
aluminum• Denser than the
crust• Holds magma that
comes out of volcanoes
Core
• Iron and nickel•Most dense•Extremely hot
Compositional vs. Physical
5 Physical Layers
• Lithosphere• Asthenosphere•Mesosphere• Outer Core• Inner Core
• Laughing• At•My• Omelet,• Interesting!
Lithosphere(Laughing)
•Crust and Upper Mantle•Rigid•Divided into
tectonic plates
Asthenosphere (At)
•Middle Mantle• Soft, plastic-like• Tectonic plates
floats on this
Mesosphere (My)
• Lower Mantle• Strong• Semi-solid (Like caramel)
Outer Core(Omelet)
•Liquid because the inner core is so hot•Reason why
Earth is a giant magnet
Inner Core (Interesting)
•Center of Earth•Solid ball•Dense•EXTREMELY hot!
Why are there layers?
•Heavier elements tend to sink to the core
• Lighter elements rise toward the crust