1. Erosion and Depistion
BY GLACIERS!

2. What is a Glacier?
a. A glacier is ________________ ___________________________ ___________________________
Glaciers occur in the polar regions and at high altitudes
a large mass of slowly
flowing ice and snow that formed from the
compaction and re-crystalization year after year.

3. b. Types of glaciers
1. _____________- glaciers that form in mountain valleys at high elevations
Ex: _______________ , _____________
______________ , ____________
2. __________- glaciers that form over vast areas of land. –Like Ice Sheets
Ex: ____________,
_____________
Valley / Alpine
Alps (Europe)
Himalayas (Asia)
Rockies (N.A)
Andes (S.A)
Continental
Greenland
Antarctica

4. Glacial Movement Movement occurs due to gravity
down a slope or outwards under it’s own pressure

5. 3. Profile of a valley glacier
alpine
Valley glaciers are called _________, and like a stream, valley glaciers move fastest in the ________.
______ moraine is rock material pushed along the front edge of a glacier.
middle
End

6. Lateral
___________- moraine is rock material on the sides of a glacier along the valley walls
__________- moraine is rock material in the middle of a valley glacier formed when the inside lateral moraine combine when two valley glaciers merge as one
__________- moraine is rock material trapped on the bottom of a glacier.
Medial
Ground

7. Moraine’s can be seen by “dirty” streaks in the glacier
medial moraine
lateral moraine

8. Erosion by glaciers Till 1.
2. As a glacier moves, it plucks up loose rock material (E)
. ____- is all the unsorted rock material carried by a glacier.
The glacier, with pieces of rock within the ice, acts like a piece of sandpaper! Can grind down mountains (E).
Results: Polished and rounded mountaintops, and scratched bedrock
Till

9. Deposition: When the Ice melts the till just drops on out!

10. Boulders from the last Wisconsin Ice advance are pushed as far as NYC
Boulders from the last Wisconsin Ice advance are pushed as far as NYC!- Shawangunk ridge, Gardiner NY

11. Glacial Erosion: Stream Valleys vs. Glacial Valleys
V-shaped valley
eroded by a __________
U-shaped valley
eroded by a __________
stream
glacier

12. BANFF National Park, Canada

13. 4. Stream Valleys vs. Glacial Valleys
U-shaped
V-shaped

14. Post Glacial Landscape Features, Depositional or Erosional
Post Glacial Landscape Features, Depositional or Erosional? Formation of Long Island: Lesson Interactive: Moraines and outwash plains

15. Esker- long winding ridge of sediment.
Drumlins- elongated hills formed when a glacier slides over a pile of sediment. (looks like spoons-D)
Esker- long winding ridge of sediment.
- SORTED and layered because it is deposited by running water under glacier

16. Kame- irregular shaped hill of unsorted sediment
Kettles & Kettle-Lakes- when a block of ice indents the soil to create a depression. If it melts it forms a “kettle” lake (D)
Kame- irregular shaped hill of unsorted sediment
(forms when sediment flows into cracks of glacier) (D)

17. Erratics- a large rock plucked up and dropped off by the glacier (D)
Striations - parallel lines in the bedrock caused by rock fragments scratching (E)
Erratics- a large rock plucked up and dropped off by the glacier (D)

18. MORAINES: Depositional

19. How glaciers move - budget

20. Ablation vs. Accumulation
A glacier gains and loses ice each year
Ablation= the amount lost due to melting
Accumulation= the amt. of snow and ice added at the end of the year

21. Relationships of Ice gain/loss
If the net accumulation > ablation= Glacial Advance
If net accumulation < ablation= Glacial Retreat
If there is no net gain or loss of ice (accumulation= Ablation) the glacier is stationary (NOT MOVING )

22. Recognizing a net loss graphically

23. Most Glaciers are retreating globally at this moment in time 