Overview Upper river formations Flashcards
What begins the erotion of a v-shaped valley?
The vertical errosion of water flowing down the hill,
What is hydraulic action?
This is when waters power just tears pieces of rock and other materials out
What is the second stage of v-shaped valleys formation?
Freeze thaw weathering ( When water ices up in the rock, making it crack and break up
What is freeze thaw weathering?
When water runs int cracks in the rock and turns to ice it expands and pushs the rocks apart
What is the third stage of v-shaped valleys formation?
The broken rocks aid in corroding the sides of the valley further
What is the four and final stage of v-shaped valley formation?
The rocks are tranported down stream which widens and deepens the river
Which stage of a river does a v-shaped valley occur?
The upper stage of the river
What is the second formation to be found in The upper stage of the river
Waterfall
How many stages are there in the formation of waterfalls
Three
What is needed for a waterfall to occur?
Hard rock lying on softer rock
What is the first stage of a waterfalls formation?
A plunge pool is formed by hydraulic action
What is the second stage of the formation of waterfalls?
The overhanging harder rock collapse because it has no support
What is the third and final stage of a waterfalls formation?
The collapsed rock aids in corroding the softer rock and this leads to the waterfall constantly retreating back up river
What other Formation is created by this retreat?
A Gorge
What is a Gorge?
A Gorge is narrow valley with steep / vertical
