’ , ▁thus ▁imper fect ly ▁‘ it ▁becomes ▁a ▁se am ’ , ▁but ▁if ▁uma a q , ▁then ▁it ▁becomes ▁‘ rip ▁( at ▁the ▁se am ) ’ , ▁a ▁verb , ▁which ▁would ▁mean ▁something ▁like ▁‘ it ▁has ▁a ▁habit ▁of ▁ri pping ▁at ▁the ▁se am ’ . ▁ ▁See ▁also ▁▁ ▁Ad der ▁stone , ▁E uras ian ▁natural ▁rocks ▁with ▁holes . ▁ ▁Cup stone , ▁true ▁Native ▁American ▁artifact s . ▁ ▁Ph ol ad ▁bor ings , ▁similar ▁rock ▁holes ▁caused ▁by ▁certain ▁types ▁of ▁b ival ves . ▁▁ ▁Lith ic ▁technology ▁ ▁References ▁ ▁Pr est , ▁V . K . ▁( 1 9 9 0 ) ▁Laurent ide ▁ice - flow ▁patterns : ▁A ▁historical ▁review , ▁and ▁imp lications ▁of ▁the ▁dispers al ▁of ▁Bel cher ▁Island ▁er rat ics . ▁Géographie ▁Phys ique ▁et ▁Qu atern aire ▁ 4 4 ( 2 ): 1 1 3 - 1 3 6 . ▁ ▁Category : S ed iment ology <0x0A> </s> ▁This ▁is ▁a ▁list ▁of ▁national ▁convent ions ▁of ▁K appa ▁K appa ▁P si ▁( Κ Κ Ψ ), ▁National ▁Honor ary ▁Band ▁F rat ern ity , ▁and ▁T au ▁B eta ▁S igma ▁( Τ Β Σ ), ▁National ▁Honor ary ▁Band ▁Sor or ity . ▁The ▁two ▁organizations ▁hold ▁joint ▁national ▁convent ions ▁every ▁two ▁years ▁in ▁odd - number ed ▁years . ▁ ▁The ▁national ▁convention ▁serves ▁as ▁the ▁gover ning ▁body