Earth Systems: Interior of Earth Earth Basics 71% Earths surface covered with H2O Slightly flattened sphere oblate spheroid
Surface is fairly smooth 3rd planet (rock) from the sun 5th largest planet (12,756 km diameter) Gravity force of attraction between matter (6 times greater than the moon!)
Earths Interior Earths Interior Properties determined by changes in speed and direction of seismic waves Seismic waves are vibrations that travel
through Earth Compositional Zones: Crust thin outermost layer of Earth above the mantle Oceanic Crust beneath the oceans
(5 -10 km thick) Continental Crust makes up the continents (15 80 km thick) Mantle layer of rock between the crust and core
Core central part of Earth below the mantle composed of Iron and Nickel Compositional Zones Structural Zones:
Lithosphere solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle Asthenosphere solid, plastic like layer of the mantle which can flow and move the tectonic plates above it
Mesosphere the middle sphere, strong, lower part of the mantle, made of solid rock Structural Zones: Outer Core dense liquid of iron and
nickel Inner Core dense rigid solid of iron and nickel Earth is Magnetic Two magnetic poles create magnetic field
surrounding Earth May be caused by movement of liquid iron in outer core Sun and moon have magnetic fields but sun has no iron and moon has no liquid outer core
As liquid moves, electric currents create magnetic field Earths Magnetic Field
La teoria situazionale sui pubblici Grunig parte dalla posizione di Dewey e Blumer, per cui i pubblici sono "componenti critiche del processo democratico che riconoscono i problemi che li riguardano e si organizzano e agiscono per risolverli".
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