1. March 09, 2015
Agenda
Roll
PowerPoint: Erosion and Deposition by Ice Part 2 Possible Video “Our Changing Earth”

2. Questions Subject Area: Erosion and Deposition by Ice
EQ: How did glaciers shape the landscape of California?
Questions
Why are glaciers important agents of erosion and deposition?
How does ice in a glacier flow?
What are some of the landforms eroded by glaciers and some of the landforms deposited by glaciers?

3. Erosion and Deposition by Ice
A glacier is an enormous mass of moving ice. Glaciers are very heavy and have the ability to move across the Earth’s surface. Glaciers can erode and deposit large amounts of rock material.

4. Glaciers – Rivers of Ice
Glaciers are in areas where it is very cold. The snow will build up and cause the deep packed snow to become crystals. The pull of gravity on this extraordinary mass will cause the “rivers of ice” to flow.

5. Types of Glaciers
There are two main types of glaciers, alpine and continental.
What do you think the difference is between Alpine and Continental Glaciers?
Response: I think the difference between Alpine and Continental Glaciers is…

6. Alpine Glaciers
The alpine glacier will form in mountainous areas. A type of alpine glacier is a valley glacier. Valley glaciers form in valleys originally created by stream erosion. These glaciers will flow downhill, widening and straightening the valley.

7. Alpine Glaciers
Another type of alpine glacier is a Piedmont Glacier. Piedmont glaciers form at the base of mountain ranges.

8. Continental Glaciers
Continental glaciers are not rivers of ice they get larger and spread over an entire continent.
How do continental glaciers smooth the landscape?
Response: Continental glaciers smooth the landscape by …

9. Ice Sheet
Ice sheets cover millions of square kilometers with ice. The continent of Antarctica is covered by one of the largest ice sheets in the world.

10. Ice Shelf
An ice shelf is an area where the ice is attached to the ice sheet but is resting on open water.

11. Icebergs
Icebergs are large pieces of ice that break off an ice shelf and drift into the ocean.

12. Calving
The process by which an iceberg forms is called calving. Calving is when huge pieces of ice fall into the sea as the iceberg breaks free of the ice sheet.

13. Movement of Glaciers
When enough ice builds up on a slope, the ice begins to move downhill. Thick glaciers move faster than thin glaciers.
How does glaciers change the appearance of mountains?
Response: Glaciers change the appearance of mountains by …
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14. Glaciers: Icy Movers and Shapers
What did you know?
_____________________________________________
2. What did you learn?
3. What do you want to know?

15. Crevasse
A crevasse is a large crack that forms where the glacier picks up speed or flows over a high point. They form because ice cannot stretch quickly and cracks. They can be hidden by a layer of snow.
How are ice crevasses related to glacier flow?
Response: Ice crevasses are related to glacier flow because …

16. Landforms Carved by Glaciers
Alpine glaciers and continental glaciers produce very different landscapes. Alpine glaciers carve out rugged features. Continental glaciers smooth out the landscape, by scraping and removing rough features.
How do alpine glaciers create a rugged landscape?
Response: Alpine glaciers create a rugged landscape by…

17. Features carved by Alpine Glaciers
Cirques are bowl like depressions where glacial ice cuts back into the mountain.

18. Features carved by Alpine Glaciers
Horns are sharp pyramid-shaped peaks that form when three or more cirques erode the mountain.

19. Features carved by Alpine Glaciers
Arêtes are jagged ridges that form between two or more cirques cutting into the same mountain.

20. Features carved by Alpine Glaciers
U-shaped valleys are formed when glaciers flow into and erodes a valley, changing the valley from its original v-shape to a u-shape.

21. Features carved by Alpine Glaciers
Hanging Valleys are smaller glacial valleys that join the deeper main valley. Many hanging valleys form water falls after the ice is gone.
What are some of the features created by Alpine Glaciers?
Response: Some features created by Alpine Glaciers are …

22. Striations
Striations are grooves carved by glaciers that help scientists determine the direction of the ice flow.

23. Types of Glacial Deposits
Glacial drift is the general term used to describe all the material carried and deposited by glaciers.

24. Stratified Drift
Rock material that has been sorted and deposited in layers by water flowing from the melted ice is called stratified drift.

25. Till
Till is unsorted rock material that is deposited directly by the ice when it melts.

26. Moraines
Moraines generally form ridges along the edges of glaciers. They are produced when glaciers carry material to the front of the ice and along the sides of the ice.
What do moraines indicate?
Response: Moraines will indicate …

27. Summary
Answer the essential question “How did glaciers shape the landscape of California? ”
Your answer needs to be in complete sentences.
Place your answer at the bottom of the notes we did today.
Make sure you include how glaciers erode and deposit material.
Use your notes to get the answers.

28. Our Changing Earth What did you know?
_____________________________________________
2. What did you learn?
3. What do you want to know?

29. Homework
Chapter 11, Section 3 in the purple workbook. This is found on pages 86 – 89.

30. Talking Punishment
Today I have decided to break the rules of Mr. Elsmore’s classroom and have been granted the opportunity to write this paragraph. Unfortunately, it is possible that I have been granted this opportunity because of the actions of another student and not because of my actions. I will be forever indebted to that particular student or group of students for this wonderful opportunity to have to write instead of watching the video that was planned for today. I will make sure to let that student or students know how I appreciate this opportunity and show my gratitude by asking them to stop the breaking of the rules in Mr. Elsmore’s classroom. If you are the one responsible for this punishment please learn how to be mature enough to follow the five simple rules that Mr. Elsmore created to make this classroom an atmosphere of learning and kindness. If we have any more problems then we will get the wonderful opportunity to write this paragraph again and possibly loose the drawing at the end of the triad. All because I cannot or my fellow student cannot follow the rules. What a shame!!!

31. Alaska’s National Parks
What did you know?
_____________________________________________
2. What did you learn?
3. What do you want to know?