Collapse sinkholes, like Cedar Sink, form after an initial subsurface collapse occurs.
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Many fortunes have been made, but over all, there are more collapsing sinkholes than erupting geysers.
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The mostly bare summit plateau of Kamarkawarai-tepui has a large, collapsed sinkhole opening in its western portion.
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The Prelesnik Sink ( ) is a large collapse sinkhole that was created when a large karst cave collapsed, creating steep walls on all sides.
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On-shore caves of similar formation, as large collapsed sinkholes, are well known in Belize and in the Yucat�n Peninsula, where they are known as " cenotes ".
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The Patriots can't run because their line doesn't make holes that stay open long enough for slender running backs like Allen to fit through before they fill in like a collapsing sinkhole.