Edexcel A Level Geography - Tectonics 1 - Structure and plate boundaries

What is the structure of the earth

crust, lithosphere, asthenosphere, mantle, outer core, inner core

what is the crust split into

oceanic crust, continental crust

oceanic crust overview

made off basalt, more dense than continental, 7km thick

continental crust overview

made off granite, 70km thick, less dense than oceanic

what is the outer core made off

12% sulphur, 88% iron

what is the inner core made off

20% nickel, 80% iron

4 types of plate boundaries

convergent, divergent, collision, conservative

what happens at a divergent plate boundary

plates move apart, forms volcanos and EQs

what happens at a convergent plate boundary

plates move under each other, one starts to sink, between a oceanic and continental plate, cause volcanos and EQs

what happens at a collision plate boundary

plates move towards and collide, cause mountains

what happens at a conservative plate boundary

plates slide past each other, cause EQs