A kettle hole is a depression in glacial drift formed by the melting of a detached block of stagnant ice that was buried in the drift.
(A kettle hole; is; a depression in glacial drift) (glacial drift; formed; by the melting of a detached block of stagnant ice) (stagnant ice; was buried; in the drift)
A kettle hole glacial drift stagnant ice
is formed was buried
a depression in glacial drift
by the melting of a detached block of stagnant ice
in the drift