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A receding waterfall is:

a waterfall that through hydraulic action and corrasion, slowly over thousands of years moves backwards.

this happens because the water flowing over the fall erodes the earth below and creates a plunge pool, the earth that was worn away is used to corrode the soft rocks at the base of the waterfall, after the base is corroded the harder rocks above are unsupported and collapse due to gravity.

this process happens over and over again and that is how waterfalls recede.

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Q: What are retreating waterfalls?
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