Processes That Cause Waterfall Formation Flashcards
1
Q
process that causes water fall formation
A
Waterfalls occur when a river crosses a bed of more resistant rock
Erosion of the less resistant rock underneath continues undercutting the hard rock above it .this creates a plunge pool under the more resistant rock
The less resistant rock beneath is eroded more rapidly by abrasion and hydraulic action. This creates a ledge of resistant Rock which overhangs and collapses as it’s weight is no longer being supported
The waterfall retreats upstream leaving a steep valley or gorge .
