Kolk
WiktionaryText
Noun
- an underwater vortex similar to a whirlwind. Capable of dislodging, picking up, and moving boulders.
- A whirlpool or tornado effect that forms in deep, fast moving water. Kolks can pick up solid blocks of basalt in flood areas. http://www.kidscosmos.org/kid-stuff/mars-trip-glossary-hn.html