Glaciers and Long Island

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Presentation transcript:

Glaciers and Long Island How are Glaciers and Long Island related?

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

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

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

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

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

Striations

Polish

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.

Erratic

Central Park, NYC

Drumlin

Lakes Kettle Formation:

Kettle Lakes

Glacial Lake Forms when ice dams a stream.

Ice Age Glacier Limit

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