eruptive vs labile

eruptive

• That erupts or bursts forth. 

• Produced by eruption. 

• Accompanied by eruptions. 

• An eruptive rock, one produced by eruption. 

labile

• Liable to slip, err, fall, or apostatize. 

• Able to change valency without changing its form; especially, able to be used both transitively and intransitively without changing its form. 

• Apt or likely to change. 

• Kinetically unstable; rapidly cleaved (and possibly reformed).