Couldn’t help but add this (to your annoyance ;-)

‘eruption’ and ‘irruption’ are good examples of prefixes ‘e-‘ and ‘i-‘.The root ‘rupt’ is from Latin rumpere (= to break; as in ‘rupture’). Prefix e- (=out) makes ‘erupt’ mean ‘break out’ and prefix i- (=from in/within) takes the form ‘ir-‘ to make ‘irrupt’ mean ‘break from within’ (very much the same as ‘erupt’).

There are also interesting words like ‘ab-rupt’, (bank-rupt ;-), ‘cor-rupt’, ‘dis-rupt’, ‘inter-rupt’, ‘un-inter-rupt’ ;-),…