Core convection

I. thermal convection
crystallisation of iron at ICB -> releases :

 - latent heat
 - light constituents

additional thermal convection (less important) -> heat released due to :

 - radioactive decay	
 - primordial heat 

note :

this thermal convection could be controled by the thermally heterogeneous 
mantle





II. the compositional convection is due to the crystallisation of iron for 
forming the inner core and release of lign element in liquid core. It is thought to be the most important



III.the main flow is usually when core flow is modeled, outside of the axially aligned 
cylinder tangent to inner core but sometimes in case of geodynamomodel, the flow can also be 
important inside the tangent cylinder



IV. possibly the outer layers of liquid core could be stably stratified