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" ... Believe it or not, but our universe is brimming with convection. Think about it: to make a liquid or gas convect, it just needs to be hotter on one side than on the other. And there are so many awesome scenarios where that can happen, but I'll just focus on one today. Something you're very, very familiar with already: the sun. ... "
" ... If the material remained in the core, it would decay into lithium and then be destroyed by the high-energy conditions found there. But the saving grace is that red giant stars can go through phases where they convect: dredge-up phases, which transports material from the core to the cooler, sparser outer layers. When these stars then die, the lithium-7, now found in the outer layers, gets blown off and returned to the interstellar medium. ... "