Some of the bogs, pot holes and small lakes are actually kettles -- those glacial sink-holes formed when huge chunks of buried ice finally melted.
(Some of the bogs, pot holes and small lakes; are actually; kettles) (those glacial sink-holes; formed; T:when huge chunks of buried ice finally melted) (huge chunks of buried ice; melted; T:finally)
Some of the bogs, pot holes and small lakes those glacial sink-holes huge chunks of buried ice
are actually formed melted
kettles
T:when huge chunks of buried ice finally melted
T:finally