1. Title: Glacial Erosion and Deposition Page: 82 Date: 3/5/2013
Table of Contents
Title: Glacial Erosion and Deposition
Page: 82
Date: 3/5/2013

2. Objective
Students will be able to identify features of glacial erosion and deposition.

3. Word of the Day
There’s lots of ‘em.

4. Glacial Erosion
As a glacier moves it breaks pieces of rocks of valley walls and floors in a process called Plucking.
When a glacier flows over more rock, broken bits of rock in it act as sandpaper, scratching the bedrock.
Striations: small scratches
Grooves: large scratches
Both will indicate the direction of movement.

5. Glacial Erosion Features of Glacial Erosion:
Cirque: Scooped out depressions
Arete: Sharp steep ridge between two cirques
Horn: Steep pyramid shaped peak carved by three or more glaciers
Hanging Valley: Form when a small glacier feeds a large glacier and they both melt
Leaves behind waterfalls.

6. Cirque
Arete

7. Hanging Valley
Horn: Matterhorn in Switzerland Extremely famous!

8. Glacial Deposition Till: Unsorted rocks that glaciers pick up.
Moraine: Unsorted ridge of till that is deposited when glacier melts.
Terminal Moraine: Moraine at the end of a glacier.
Lateral Moraine: Located parallel to the direction of glacial flow.

9. Terminal Moraines
Lateral Moraine

10. Glacial Deposition
Outwash: Sorted gravel, sand and silt that is deposited by meltwater.
Outwash Plain: Area where outwash is deposited.

11. Glacial Outwash
Glacial Outwash Plain

12. Glacial Deposition Drumlins, Eskers and Kames:
Drumlin: Formed when continental glaciers flow over old moraines.
The old moraines get shaped into straight ridges.
Esker: Long ridges of sediments left behind by streams that flowed under glacier.
Kame: Conical mound of sediment left behind when glaciers melt.

13. Drumlin
Esker
Kame

14. Glacial Lakes
Kettles: When chunks of ice break off a glacier, they create depressions. When Ice melts those depressions fill with rain water creating a lake.
Common in Massachusetts and New York.
Walden Pond is a Kettle!

15. Kettle lakes
Walden Pond

16. Glacial Lakes Cirques may also fill with water to form a lake.
Moraine Dam: When a terminal moraine blocks off a valley, the valley will fill with water and create a lake.
Example: The Great Lakes.

17. How come Great
Lakes are not one
Giant lake?