Earth Sciences 11: Earth’s Surface
Ms. Tennant
Name:
Topic 7b – Glaciers, continued
PART I: CHECK
REVIEW from last class: Match each term on the left with its definition.
1. Crevasse
A) Rock pulverized into a powder from the weight of a glacier
2. Calving
B) A crack in a glacier
3. Plucking
C) Parallel lines on bedrock from rock under a glacier scraping
4. Iceberg
D) A hunk of a glacier breaking off into a body of water
5. Striations
E) A glacier picking a large hunk of rock out of the ground by freezing around it
6. Rock Flour
F) A hunk of glacier floating in water
PART II: LISTEN
Glacier Deposition
1. How does a glacier deposit material?
2. Is there a special name for rock materials deposited by glaciers?
3. Is till different than rock deposits from streams & rivers?
1)
Till can contain much larger pieces of rock
Erratic =
2) Till is unsorted (______________________________________________) while river deposits are sorted
(___________________________________________________)
Glacier deposit (till)
River deposit
4.
Do glaciers melt enough to form streams of water?
Streams of meltwater flow __________________________ of a glacier
Streams of meltwater run _____________________ a glacier
Streams of meltwater pour _________________________ of a glacier
5. Do these meltwater streams deposit materials?
Outwash =
*material includes _____________________________________
*material is __________________________
Outwash Plain =
PART III: WATCH
https://www.youtube.com/watch?v=AG3luuhc-5Y
Landforms from Glacier Erosion
1. Where is a cirque found?
2. What might be in the bowl of a cirque?
3. How can you tell the difference between a glacier valley and a river valley?
4. How are tributary glacial valleys different from the main glacier valley?
5. Has the level of water in the ocean increased or decreased since the last ice age?
6. Aretes sit _____________________ glacial valleys.
PART IV: ASSIGNMENT
1. Show how glaciers erode a landscape. For help on the details to include, compare pictures 1 and 3 on p.325 of the
text. Use pencil!
Mountains before glacial erosion
Mountains after glacial erosion
NOW LABEL a cirque, horn, arête, U-shaped valley, & hanging valley in
your picture!
2. Complete the table showing landforms caused by glacier erosion.
3. If finished, fill in the table for landforms caused by glacier deposition.