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Glaciers How are Glaciers and Long Island related?

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Presentation on theme: "Glaciers How are Glaciers and Long Island related?"— Presentation transcript:

1 Glaciers How are Glaciers and Long Island related?

2 Glaciers Snowfall exceeds melting. High altitudes and polar regions. Gravity moves mass downhill. Firn = very dense snow layer.

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5 Continental Glaciers Ice sheets that cover continents. Kilometers thick. Only 2 exist: - Greenland and Antarctica

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7 Valley Glaciers Begins in a cirque = bowl-shaped basin at mountaintop. Crevasses = cracks in the glacier.

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9 Erosion U-shaped Valleys Cirques, Aretes and Horns. Hanging Valleys - from tributary

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17 Erosion Striations = parallel scratches on bedrock... from rocks on bottom of glacier Polish = fine material rubs rock smooth.

18 Striations

19 Polish

20 Deposition Moraines - 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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22 Erratic

23 Central Park, NYC

24 Drumlin

25 Lakes Kettle Formation:

26 Kettle Lakes

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28 Glacial Lake Forms when ice dams a stream.

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31 Ice Age Glacier Limit

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