Snowline decides the limit of glacier work as an agent of erosion because-
1. Snowline is the lower limit of permanent snow cover; below which snow does not accumulate.
2. The glacier moves through pre-existing valley and forms erosive action.
3. The glacier performs plucking and abrasion processes on the rocks on its way.
4. Below the snowline is the snow frees surface, where the erosional features are not formed.
