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Shaping landscapes 4.5: Sediment deposition
Shaping landscapes 4.5:
Sediment deposition
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Shaping landscapes 4.5:
Sediment deposition
Slide 1 - Diapositive
The form of the pebbles in this picture has been caused by ...
A
1. Weathering
B
2. Erosion
C
3. Sediment deposition
Slide 2 - Quiz
Which valley do you see in this picture?
A
V-shaped valley
B
U-shaped valley
Slide 3 - Quiz
Sediment deposition
Weathering
Erosion
Slide 4 - Question de remorquage
Goals
After studying this section, you will be able to:
- Explain how rivers form deltas
- Describe how the Mississippi delta landscape was affected by Hurricane Katrina
Slide 5 - Diapositive
Sediment deposition
The last step of the exogenous forces is
sediment deposition
: putting down sedimentary rock.
By rivers: the slower the speed, the smaller the sediment.
Glaciers: morenes
Slide 6 - Diapositive
Slide 7 - Vidéo
A
delta
is a landform created by a river due to the deposition of sediments. The landscape is very flat and located just above sea level.
Slide 8 - Diapositive
Lower course/ river mouth
1. River slows down in lower course and can no longer carry the sediments
2. Sediments sink downwards
3. When the river deposits more material than the sea can remove it, sediment plumes are formed
Slide 9 - Diapositive
but...
the Mississippi river is affected by a lot of hurricanes
Slide 10 - Diapositive
Slide 11 - Vidéo
What needs to be the minimum of the sea temperature to form a hurricane?
A
18 degrees Celsius
B
25 degrees Celsius
C
27 degrees Celsius
D
34 degrees Celsius
Slide 12 - Quiz
Describe in your own words how hurricanes are formed (use full sentences!)
Slide 13 - Question ouverte
Two other names for hurricanes are:
Slide 14 - Question ouverte
What are the possible effects of a hurricane?
Slide 15 - Question ouverte
Talking point
We live in a delta that is protected by dykes, dunes and dams, but not every delta country can afford this kind of protection.
Bangladesh for example has little money to invest in flood protection.
What could be done to make this a fairer situation?
Slide 16 - Diapositive
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