4 Main Layers of the Earth

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4 Main Layers of the Earth
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Crust
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• Oceanic Crust dense basaltic rock
• Continental Crust - light granite rock

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MANTLE

• largest layer of the Earth
• composed of hot, flowing rock
• moves because of convection currents

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Outer Core composed of liquid nickel and iron
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• Inner Core composed of nickel and iron that is
  exposed to high temperatures and pressure so even
  though its hot enough to be a liquid the pressure
  keeps in a solid phase

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Plate Tectonics

• Plates The thin, fragile and rigid lithosphere
  is broken up into 12 main plates. The plates move
  very slowly (1-4 inches per year).

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• Plate Tectonics a theory that explains
  movements of continents and changes in earths
  crust caused by internal forces within the
  planet.

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Plate Boundaries

• 1) Convergent boundary where two plates collide
  causing
• Mountain building
• Subduction Zone

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• Divergent the boundary where two plates are
  separating. The plates move in opposite
  directions and magma rises to fill in void.

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• Transform boundary where two plates slide past
  each other.

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Faults

• point where plates meet one another
• areas of increased earthquake and volcano activity

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• StrikeSlip occur where plates meet evenly and
  slip past each other

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• Normal when one side of a fault slips down

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• Thrust one side of a fault is driven up and
  over the other

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