D2E1G2L1A1C3I1A1T1I1O1N1
16 points
DEGLACIATION is validvalid
the retreat of a glacier [n DEGLACIATIONS]
the melting of ice due to the retreat of a glacier [n -S]
the retreat of a glacier [n DEGLACIATIONS]
the melting of ice due to the retreat of a glacier [n -S]