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The creation of U-shaped valleys and V-shaped valleys
Shaping landscapes:
U-shaped valleys and V-shaped valleys
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Aardrijkskunde
Middelbare school
havo, vwo
Leerjaar 1
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Shaping landscapes:
U-shaped valleys and V-shaped valleys
Slide 1 - Diapositive
Learning objectives
After this lesson you can:
describe in your own words how glaciers shape a landscape;
name 5 glacial erosional landforms;
name the erosive process that creates U-shaped valleys;
name 1 depositional landform created by glaciers;
name the erosive process that creates V-shaped valleys;
name 1 distinctive feature of both a U-shaped valley and a V-shaped valley;
recognise on a picture or in real life when travelling abroad if a valley was created by a glacier or by a river.
Slide 2 - Diapositive
Flashback:
What two kinds of forces shape the landscape on Earth?
Slide 3 - Question ouverte
Flashback:
endogenous or exogenous forces at work?
Slide 4 - Diapositive
Flashback:
endogenous or exogenous forces at work?
Slide 5 - Diapositive
Flashback:
endogenous or exogenous forces at work?
Slide 6 - Diapositive
Glacial erosional landforms
Slide 7 - Diapositive
How glaciers shape the landscape
Plucking: rocks pulled off and carried away by the ice.
Abrasion: grinding like sandpaper.
Slide 8 - Diapositive
Depositional landforms created by glaciers
Deposition: putting down rocks and sediment.
Moraines.
Also visible after glacier has melted away.
Slide 9 - Diapositive
Leftover from a retreating glacier: U-shaped valley
Hanging valleys
Steep valley walls
Slide 10 - Diapositive
Example of a U-shaped valley:
Yosemite Valley, Yosemite National Park, USA
Slide 11 - Diapositive
Flashback:
endogenous or exogenous forces at work?
Slide 12 - Diapositive
How rivers shape the landscape
Water erodes river bed and river banks.
Rivers flow faster in the upper river course, close to their source.
High bedload transport in upper river course.
V-shaped valleys can be found in the upper river course.
Slide 13 - Diapositive
How rivers deposit sediment
Boulders
Pebbles
Coarse sand
(Fine) sand
Silt
Slide 14 - Diapositive
Flashback:
Rivers can erode rock. How do we call this type of erosion?
Slide 15 - Question ouverte
Cette vidéo n'est plus disponible
How fluvial erosion leads to a V-shaped valley
Slide 16 - Diapositive
Formed by a river: V-shaped valley
Valley walls are usually less steep compared to U-shaped valleys.
Harder rock → steeper valley walls.
Slide 17 - Diapositive
Example of a V-shaped valley:
Grand Canyon of the Yellowstone, USA
Slide 18 - Diapositive
What is the starting point of a glacier?
A
arête
B
hanging valley
C
cirque
D
pyramidal peak
Slide 19 - Quiz
How do we call the scraping of rocks along the bottom and sides of a glacier?
A
abrasion
B
plucking
C
ice flow
D
deposition
Slide 20 - Quiz
True or false:
Tributary glaciers erode smaller valleys than trunk glaciers.
A
true
B
false
Slide 21 - Quiz
Tributary glacier
Cirque
Arête
Terminal moraine
Trunk glacier
Slide 22 - Question de remorquage
True or false:
Rivers deposit more sediment in the upper course than in the lower course.
A
true
B
false
Slide 23 - Quiz
Which statement about V-shaped valleys is correct?
A
If the rocks are soft and easy to erode by a river, then the walls of the valley become very steep.
B
Hanging valleys are distinctive features of V-shaped valleys.
C
V-shaped valleys are primarily formed in the middle course of rivers.
D
A V-shaped valley is formed when the sides of the valley break off due to mechanical weathering and mass movement.
Slide 24 - Quiz
What kind of valley do you see here?
A
U-shaped valley
B
V-shaped valley
Slide 25 - Quiz
What did you learn from this lesson that you did not know before?
Slide 26 - Carte mentale
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