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5 Cards in this Set

  • Front
  • Back

Properties of Oceanic Crust

5-10 km thick


Denser


Newer


Thinner


Heavier


Destroyed at destructive plate margins


Forms at constructive plate margins


Subducts at continental plate boundary



Properties of Continental Crust

Older


Thicker


Less dense


Lighter


25-100km thick


Doesnt subduct


Cannot be destroyed


New crust isnt formed

Types of plate boundaries

Constructive - where the plates are moving apart


Conservative - where the plates slide past each other


Destructive - where the plates collide ( also collision zones are a type of these)

Structure of the Earth

Solid inner core


Outer core (liquid iron and nickel)


Mantle (soft molten rock)


Crust (hard outer shell)


How do plates move?

Convection currents in the mantle