Glaciers. Glacier. a thick ice mass that originates on land from the accumulation, compaction, and recrystallization of snow. Agents of erosion – acquire, transport and deposit sediment Occupy ~10% of land area “Interrupts” hydrologic cycle by “locking up” water. Glacier Types.
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1. Valley (Alpine)
2. Ice sheets (Continental glacier)
In -Zone of accumulation
Snow accumulates and forms ice
Outer limit is the snowline
Out – Zone of wastage
ablation – general term for loss of ice or snow from a glacier
Zone of Accumulation
Plucking – loosen and lift blocks of rock (mechanical weathering)
Abrasion – sediment in ice acts as giant “sandpaper”
Creates Rock flour – very fine-grained material
Creates Striations – grooves scratched in bedrock that indicate direction of ice movement