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Describe Sink Holes.

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- Deep vertical holes formed on limestone rocks when solution extends the grikes.
- Referred to as swallow/sink holes because surface runoff or river water may disappear through them as a waterfall and come out of the ground as a vauclusian spring further downhill.
- Vertical shaft from the surface of the sink hole down into the ground is called ponor.

Kavungya answered the question on May 3, 2019 at 13:21

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Describe Sink Holes.

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