As the heated water threads its way through the cooler water, the friction of water rubbing on water and on the glass sides causes turbulence.
(the heated water; threads; its way; through the cooler water) (water; rubbing; on water and on the glass sides) (the friction of water; causes; turbulence)
the heated water water the friction of water
threads rubbing causes
its way through the cooler water
on water and on the glass sides
turbulence