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

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

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.

River erosion often forms V shaped valleys

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 http://junior.edumedia-sciences.com/en/a613-erosion-v-shaped-valley

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

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

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

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

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?

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

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

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

Before ice age V-shaped valley

During Ice Age Valley Glacier Scours rock Glacial Abrasion

After ice age U-shaped valley

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

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

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

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

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.