glaciers how are glaciers and long island related?
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Glaciers
How are
Glaciers and Long Island
related?
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Glaciers
Snowfall exceeds melting.
High altitudes and polar regions.
Gravity moves mass downhill.
Firn = very dense snow layer.
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Continental Glaciers
Ice sheets that cover continents.
Kilometers thick.
Only 2 exist:
- Greenland and Antarctica
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Valley Glaciers
Begins in a cirque = bowl-shaped basin at mountaintop.
Crevasses = cracks in the glacier.
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Erosion
U-shaped Valleys
Cirques, Aretes and Horns.
Hanging Valleys - from tributary
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Erosion
Striations = parallel scratches on bedrock... from rocks on bottom of glacier
Polish = fine material rubs rock smooth.
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Striations
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Polish
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DepositionMoraines - Unsorted pile of debris = till
Erratics = large isolated boulders.
Drumlins = long, low mounds of till with teardrop shape.
Outwash Plain (sorted) = sediments that are “washed out” in front of glacier.
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Erratic
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Central Park, NYC
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Drumlin
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Lakes
Kettle Formation:
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Kettle Lakes
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Glacial LakeForms when ice dams a stream.
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Ice Age Glacier Limit
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