kolk or colc (KOHLK) - n., (geol.) an underwater vortex similar to a whirlwind.
Can move large boulders under the water and create deep pits. These are mostly evident form kolks formed during floods, but they also can appear in bedrock, such as the Columbia Basin scablands. The word is from Dutch, as the Dutch first identified them during dyke breaches.

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---L.
Can move large boulders under the water and create deep pits. These are mostly evident form kolks formed during floods, but they also can appear in bedrock, such as the Columbia Basin scablands. The word is from Dutch, as the Dutch first identified them during dyke breaches.
Thanks, WikiMedia!
---L.