Year 9 Core Socrrative 2 Flashcards
When are v shaped valleys produced
As the river erodes its bed
Why does the river only have enough energy to erode downwards
Because the rivers discharge is low in the upper course
What happens slowly on v shaped valleys
The valleys sides are slowly broken down due to weathering
How are the valleys made steep
The weather material is transported towards the river channel
What are interlocking spurs
They are land that altérantes from either side of a v shaped valley
Where are waterfalls found
In the upper course of the river
What does the river flow over
The river flows over soft and hard rock eroding the soft rock quicker
What sticks out causing a step to form
Hard rock
What will happen to the step after a while
It will collapse
What are meaders
They are sweeping bends in a river made by a process of deposition and erosion
What happens in the inside of the bend
Deposition
What happens on the inside of the bend
Erosion
What are oxbow lakes
When one river splits into a river and a lake
What happens overtime in oxbow lakes due to erosion of the river cliff and the deposition of the slip off slope
It gets narrower
What happens to the oxbow lake after heavy rain or flooding
The river gains energy and bursts through
What happens to the oxbow lake after further deposition
It will cut of the loop and creates an oxbow lake
What are floodplains
When water is absorbed into water and silt is on top of it
What’s a lève
A natural embankment of depositioned material sometimes strengthened to protect the surrounding area from floods
What’s flooding
When a river has to much water in its channel and it floods its surrounding lands
Name 2 physical causes of flooding
Heavy rain snowmelt
Name me the two causes of human flooding
Deforestation and urbanisation
What’s it called if the rain can’t soak into the ground
impermeable
