ANSWERS: 6
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miles=x +4 ...I see you are on a streak hun
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Nobody knows, because they haven't been discovered yet.
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no one could ever know !
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three
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According to the USGS, based on historical data and geological projections, approximately 12,678 miles of caves have yet to be discovered. This does not include the 2,397 miles of caves that have been discovered but not explored. this data includes caves that cannot be explored by man due to their depth and access points.
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an undetermined number. +4
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