1. Extension: Describe this valley
Key Question: To be able to describe valleys and explain how they form.
Key Words:
V-shaped valley
U –shaped valley
Glacial erosion
Fluvial erosion
Extension: Describe this valley

2. Starter: On your mini whiteboards draw what is being described?

4. V-shaped Valleys
Watch the following video about the upper course of the River Severn.
Now, work in pairs to complete the questions on your video sheet.

5. River erosion often forms V shaped valleys

6. River erosion often forms V shaped valleys
Draw this sketch full page to the left hand half of your book (the other is for explanation).
V-shaped valleys form by
fluvial erosion

7. So how does a v-shaped valley form?
………………… erosion (in the form of …………………, …………………..and ………………….) in the river channel results in the formation of a steep sided ………………..

Over time the sides of this valley are by ………………….. processes and continued …………………... erosion at the base of the valley.

Gradually movement of materials occurs due to ……………………. down the valley sides, gradually creating the distinctive … -……….

This material is then gradually …………………………… away by the river when there is enough ………………. to do so.

As the river flows through the ………………. it is forced to swing from side to side around more resistant rock outcrops (…......).
As there is little energy for ……………….. erosion, the river continues to cut down …………………… deepening the valley and flowing between spurs of higher land creating …………………………. spurs.
Vertical
abrasion
hydraulic action
solution
valley
weakened
weathering
Vertical
mass
gravity
V - Shape
transported
energy
valley
spurs
lateral
vertically
interlocking

8. River erosion often forms V shaped valleys
Label features of the upper course on the above map

9. Label as many features on this river system diagrams as you can

10. Features of a drainage basin
Flood plain (covered in Alluvium)

11. Extension: Suggest how this valley may have formed?
Key Question: To be able to describe valleys and explain how they form.
Key Words:
V-shaped valley
U –shaped valley
Glacial erosion
Fluvial erosion
Extension: Suggest how this valley may have formed?

12. Watch the Video and answer the questions on your sheet!!!

13. U-shaped Valleys (Glacial Trough)
Animation
Explain how a U-shaped valley
forms using these words:
Cross Section
Map
Glacial abrasion
Valley Glacier
U-shaped valley
During Ice Age
Scours rock
After ice age
Before ice age
V-shaped valley

14. Explain the stages to show how a U-shaped valley forms using these words:
Glacial Abrasion - Valley Glacier
U shaped Valley - During Ice Age
Scours Rock - After Ice Age
Before Ice Age - V-shaped Valley

15. Before ice age
V-shaped valley

16. During Ice Age
Valley Glacier
Scours rock
Glacial Abrasion

17. After ice age
U-shaped valley

18. Flat valley floor
Pyramidal Peak
Corrie lake
(Tarn)
Corrie
Arete
Hanging Waterfall
Steep U-shaped Sides
Till Covers Valley

19. Till covers valley floor
How can we tell they were cut by ice?
Direction of Ice Flow
Mis-fit stream
Striations
Till covers valley floor

20. U-shape V-shape Less steep sides with river filling bottom
Complete the table to show the similarities and differences between V-Shaped and U-shaped Valleys
U-shape
V-shape
Shape?
Structure?
Size?
Processes that formed them?
Other Features?
Less steep sides with river
filling bottom
Steep sides with flat
bottom
River and boulders fill
bottom of valley
Cut out of solid rock
Larger (wider / deeper)
Smaller
RIVERS (Abrasion, corrosion,
Hydraulic action)
ICE (Glacial Abrasion)
Till covers floor. Mis-fit
stream
Interlocking Spurs

23. Explain the stages to show how a U-shaped valley forms using these words:
Glacial Abrasion - Valley Glacier
U shaped Valley - During Ice Age
Scours Rock - After Ice Age
Before Ice Age - V-shaped Valley

24. So how does a v-shaped valley form?

………………… erosion (in the form of …………………, …………………..and ………………….) in the river channel results in the formation of a steep sided ………………..

Over time the sides of this valley are by ………………….. processes and continued …………………... erosion at the base of the valley

Gradually movement of materials occurs due to ……………………. down the valley sides, gradually creating the distinctive ………………….

This material is then gradually …………………………… away by the river when there is enough ………………. to do so.

As the river flows through the ………………. it is forced to swing from side to side around more resistant rock outcrops (…......).
As there is little energy for …………… erosion, the river continues to cut down …………………… deepening the valley and flowing between spurs of higher land creating …………………………. spurs.