glaciation

• 1. snow accumulates in north facing hollow as more snow falls in winter than melts in summer
• 2. the glacier moves downhill due to gravity
• 3. plucking is when ice freezes to bedrock and pulls loose rocks up from the valley side
• 4. abrasion is when angular rocks embeded in ice grinds the valley floor as ice moves
• 5. water in rocks cracks freeze, expand, and melt weakening the rock until fragments break of