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2/22 ERS102 - Extra Credit February 25th 4:00pm DPC Rm 117...

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2/22/08 Extra Credit- February 25 th 4:00pm DPC Rm 117 Glaciations and Maine II Important Concepts 1) How glaciers form 2) Glacial Features and interpretation 3) Hot glaciers shaped Maine’s landscape Glacial Advance and Retreat: Balance Between Accumulation and Ablation o Ablation=melting + sublimation o Glaciers Balance o Glaciers Equilibrium o Snowline= elevation above which snow remains year- round “equilibrium line” Glacial Equilibrium: Controls glacier movement o Accumulation=Ablation o Ice front does not move o Accumulation > Ablation o Accumulation < Ablation How is the movement of a glacier tied to climate? 1) Warming melt 2) Less snow (rain) change in weather Ice always moving forward even if glacier is retreating Retreat means ice is melting faster than can be replaced by flow Grounded ice: pinned on obstruction Glacial Marine sediment: Iceberg debris + outwash Glacial Effects on Landscape o Glaciers are important forces of landscape change via…
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