Chapter17 - Chapter 17: Glaciated Coasts Glaciers:...

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1 Chapter 17: Glaciated Coasts Glaciers: formation, movement, types Pleistocene Glaciation: Effects on Coastlines: Examples: Cape Cod, LI Glaciers Located on most continents Occur as narrow ribbons of flowing ice in high mountain regions Occur as thick ice sheets covering vast continental areas Occupy 10% of continental landmass (30% during last ice age) Glacier Formation Large mass of ice that flows internally Antarctica (oldest glacier active 8mya) Climate permits more snow accumulation during cooler months than ablates (ice wasting) during warmer months Glacier Formation Snow – ice – glacial ice: through expulsion of air, compaction, melting and re-crystallization Glacial ice: forms at ~50 m depth, blue in color Glacier Movement Plastic Flow: internal deformation or movement Basal Slip: sliding along the bedrock of the entire glacier Types and Distribution of Glaciers Alpine or Valley Glaciers: formed in mountainous regions where winter are long and summer are short and cool flow down old river valleys
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Chapter17 - Chapter 17: Glaciated Coasts Glaciers:...

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