Water On The Land Flashcards
In the upper course there is a lot of energy. True or false?
True
What type of erosion takes place in the upper course?
Vertical erosion
What does vertical erosion in the upper course create?
A v shaped valley
In the middle course what form of erosion takes place?
Less vertical erosion more lateral erosion
In the middle course what does the river use it’s energy for?
Transporting its load
What happens in the lower course of a river?
Heavy load is carried and then deposited when the river slows down
What are the four main processes of erosion?
Hydraulic action
Attrition
Abrasion
Solution
What happens when hydraulic action takes place?
The force of the water erodes the banks and bed of the river
What happens when attrition takes place?
Rocks and pebbles bump together wearing each other down into smaller and smoother pieces
What happens when abrasion takes place?
The material carried down the river rubs against the rivers bed and banks wearing them away
What happens when solution takes place?
Minerals like calcium carbonate in limestone dissolve in river water
The four main types of transportation?
Traction
Saltation
Suspension
Solution
What is traction?
Large boulders roll along the river bed
What is saltation?
Smaller pebbles bounce along the river bed
What is suspension?
Finer sand and silt particles and carried along the river
