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Key Points in this Chapter
by AudioLearn
KEY POINTS IN THIS CHAPTER
• Glaciers can be large sheets on major continents or sit in valleys as alpine glaciers.
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• Glacial ice is layered and comes from packed snow that persists year after year.
• Glaciers move internally as well as downhill on melted water slides beneath them.
• Glaciers have depositional and erosional features.
• Glacial erosion can create polished areas of rock and U-shaped valleys.
• Deposition of glaciers leads to till. Till can be very fine or as large as erratics left behind as glaciers retreat.
• Glacial lakes are often very large. The current five great lakes in the US Midwest are proglacial lakes from the last great ice age.
