Potholes Flashcards
1
Q
What processes cause a pothole
A
Vertical erosion as they occur in the upper course where it is high above base level (high gpe).
Abrasion- pebbles carried by the river are swirled around the river bed
2
Q
How are potholes formed
A
The actions erode the rock on the river bed forming potholes. Over time they may widen and join with others to form one large pothole. The whole river bed is widened.
3
Q
Diagram of potholes
A
Look in folder
4
Q
Example of a pothole
A
Archbald pothole Pennsylvania- glacial pothole, diameter of 24m by 42 m
5
Q
What is a pothole
A
Small circular holes found at the bottom of the river bed in the upper course, the vary in diameter from a few cm to meters
