Assertion: cave's stream | /r/CapableOf | erode carbonate rocks
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Source sentences:
text: Caves in Alabama are found in three main regions: the Valley and Ridge section , which is part of both the TAG area and the southern reaches of the Appalachian mountain system; the Tennessee River Valley region , where the Tennessee River and its streams erode the carbonate rocks and create caves; and the Coastal Plain section , where people have discovered caves in the outcropping limestone beds.