Glacial Erosion. Ch 15: p 277-281. Glaciers:. Enormous masses of moving ice created by the accumulation and compaction of snow. Powerful agents of erosion ~ have carved some of the most spectacular features on Earth’s surface
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Ch 15: p 277-281
Enormous masses of moving ice created by the accumulation and compaction of snow.
Powerful agents of erosion ~ have carved some of the most spectacular features on Earth’s surface
The growth of a glacier depends on whether the snowfall from winter is greater than the snow melt in summer!
Alpine (aka Valley)
Continental (ice sheets)
Continental ice sheet
The Antarctic Ice Sheet is 1.5 times the size of the US and in some places more than 4,000 m thick
More snow falls during the winter than melts in the summer.
As snow accumulates, its weight compresses the individual snowflakes to form firn.
Internal plastic flow
Valley glacier features
Kinnerly Peak - Glacier National Park
A typical river valley
Over time, running water cuts a deeper V-shape.
Glacier fills valley, widening and straightening the channel
Glaciers melt leaving a U-shaped valley
Striations- parallel scratches made from rocks in ice scraping against bedrock
A shallow body of water made from ice blocks