Season after season, the snowpack accumulates and its weight compresses the snow below into glacier ice. Heavy snow accumulation expands the glacier, its weight pushing and moving the existing ice.
(the snowpack; accumulates; T:Season after season) (its weight; compresses; the snow; into glacier ice) (Heavy snow accumulation; expands; ) (its weight; pushing; )
the snowpack its weight Heavy snow accumulation its weight
accumulates compresses expands pushing
T:Season after season
the snow into glacier ice