The kettle hole was formed when a chunk of ice left over from the glacier and surrounded by gravel, melted and left a hole.
(The kettle hole; was formed; T:when a chunk of ice left over from the glacier and surrounded by gravel, melted and left a hole) (a chunk of ice; left over; from the glacier) (a chunk of ice; surrounded; by gravel) (a chunk of ice; melted; ) (a chunk of ice; left; a hole)
The kettle hole a chunk of ice a chunk of ice a chunk of ice a chunk of ice
was formed left over surrounded melted left
T:when a chunk of ice left over from the glacier and surrounded by gravel, melted and left a hole
from the glacier
by gravel
a hole