1. Topic
   1. PROCESS
      1. PLUCKING
      2. ABRASION
2. THE PULVERISED ROCK PRODUCED BY GLACIER -- Rock flour
3. VARIATIONS AND ITS FACTORS
   1. 1
      1. Rate of glacial movement
   2. 2
      1. Thickness of the ice
   3. 3
      1. Shape,abundance and hardness of the rock fragments
   4. 4
      1. The erodibility of the surface beneath the glacier