Eruptions begin underwater, where the lava quickly quenches, forming rinds and tongue - shaped flows that when stacked up look like piles of pillows.
Pursked algavad vee all, kus laava kiiresti tardub, moodustades koorikuid ja keelekujulisi laavakatteid, mis niiviisi üksteise otsa kuhjununa padjahunnikuid meenutavad.