Plate boundaries Flashcards
Continental crust
the earths crust which is found under the continents
Oceanic crust
the earths crust which is found under the oceans
What is earths structure from inside to out
Inner core
Outer core
Mantle
Crust
What is earths structure from outside to in
Crust
Mantle
Outer core
Inner core
What are the four features of the inner core
Radius of 1200 km
Temperatures above 6000’C
Composed of iron and nickel
Solid dense ball of metal
What are the four features of the outer core
Radius of 2200 km
Temperatures of 4000 - 5000’C
Composed of liquid iron and nickel
Moves around the inner core, creating the magnetic field
What are the six features of the mantle
Radius of 2900 km
Upto 84% of earths volume
Temperature of 3000’C
Composed of silicates of iron, magnesium & sulphides
Bottom part is malleable asthenosphere where convection currents occur
Top part is the solid lithosphere
What are the two types of Earths crust
Oceanic and Continental crust
What are the features of the oceanic crust
Composed of basalt and gabbro
6 km thick
Found under the oceans
Dense
What are the features of the continental crust
Composed of granite
35 km thick
Found under land masses (under continents)
Thick, older and less dense
What are three movements of the crust
Slab pull
Convection currents
Ridge push
What
