NCEA Level 3 Geography Practice Questions - New Zealand NCEA Level 3 Geography Exam

Plucking freezes basal ice to bedrock fractures and tears away jointed rock blocks, whereas abrasion rasps bedrock using embedded subglacial clasts. Plucking uses meltwater under high pressure to dissolve bedrock, whereas abrasion uses wind transport to scour valley walls. Plucking occurs only at the glacier surface in the accumulation zone, whereas abrasion takes place at the glacier snout. Plucking deposits lateral moraines, whereas abrasion creates outwash plains.