Glacier Terms.

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Presentation transcript:

Glacier Terms

Alpine vs. Continental Glaciers Glacier: A large mass of compacted snow and ice that moves under the force of gravity Alpine (Valley) Glaciers: A glacier that moves within valley walls Continental glacier: a glacier that covers a large part of a continent

Glacial Polish Bedrock surface smoothed by the passage of a glacier

Striations Parallel scratches on the surface of a rock caused by the movement of a glacier- aligned in the same direction as ice flow (ex. if the striation runs north to south, the glacier went from north to south)

Drumlins Oval-shaped mound of unsorted glacial till- The round end of the hill faces the direction that the glacier came from

Moraine Irregular, hilly, unsorted deposit formed at the end of an advancing glacier when the melting ice front stays at the same position for a long time (ex. Long Island)

Kettles/Kettle Lake 8. Kettle: Low spots in glacial deposits and places where large, buried ice blocks melt- leaves a hole 9. Kettle Lakes are when the holes fill in with water

Erratics A large boulder dropped by ice

Esker A ridge made by water deposition within a tunnel under the ice

Kame Deltas deposited by the water at the edge of a glacier

In Notes: Valley Shape Young riVers make V-shaped valleys Alpine glaciers make U-shaped valleys

Visualizations Seasonal Migration of Snow Observe the retreat of ice sheets from North America. Observe how glaciers erode bedrock surfaces.

Sorting (Your moment of Venn)

Venn

Videos WATCH ALL 3 VIDEOS!!! Do at least 1 note per video- total video time =10 minutes How do Glaciers Form https://www.youtube.com/watch?v=4wNOrFy17WE What is a Glacier? https://www.youtube.com/watch?v=fleXP9ljZ-o Some Review of W-E-D https://www.youtube.com/watch?v=FN6QX43QB4g