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The Clue

Surface depression due to a mine collapse (8 letter answer)

The Answer

SINKHOLE

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Notes

The answer SINKHOLE is so rare that it appears less than once every 2500 puzzles.

Related Clues

Topographical feature formed by underground erosion

Definition

SINKHOLE as a noun:

1. (sinkhole, sink, swallow hole) = a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof