
1) Dutch surname
Found on
https://www.crosswordclues.com/clue/kolk

KOLK 94.3 FM is a radio station licensed to Lakeside, Montana. The station broadcasts a Country music format and is owned by KOFI, Inc. ...
Found on
http://en.wikipedia.org/wiki/KOLK

A kolk (colc) is an underwater vortex created when rapidly rushing water passes an underwater obstacle in boundary areas of high shear. High velocity gradients produce a violently rotating column of water, similar to a tornado. Kolks can pluck multi-ton blocks of rock and transport them in suspension for thousands of metres. Kolks leave clear evid...
Found on
http://en.wikipedia.org/wiki/Kolk
No exact match found.