flashcards 0.0 / 5 ? GeographyWater and riversGCSEAQA Created by: Hannah_WilliamsonCreated on: 28-03-16 20:19 Upper Valley The upper valley is a steep v shaped valley with steep sides and is a narrow and shallow channel 1 of 9 Middle Valley Gently sloping valley sides with a deeper and wilder channel 2 of 9 Lower Valley The lower valley is a gentle very wide and almost flat valley. The channel is very wide and deep 3 of 9 Vertical erosion This deepens the river valley making it v shaped, it's dominant in the upper course of the river 4 of 9 Lateral erosion this widens the river valley and is dominant in the middle and lower courses 5 of 9 Hydraulic action The force of the water breaks rock particles away from the river channel 6 of 9 Abrasion Eroded rocks picked up by the river scrape and rub against the channel wearing it away. Most erosion happens by abrasion 7 of 9 Solution River water dissolves some types of rock like chalk and limestone 8 of 9 Attrition Eroded rocks picked up by the river smash into each other and break into smaller fragments, their edges also get rounded off as they rub together. 9 of 9
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