waterfall (UPPER COARSE,EROSION)

Question 1

name an example of a waterfall

Answer 1

torc waterfall

Question 2

give a description

Answer 2

a waterfall is a vertical drop in a riverbed that form in the youthful stage of a river due to vertical erosion

Question 3

how does it form

Answer 3

forms when a band of hard rock (e.g. granite) lies upstream of a band of soft rock(e.g. chalk/limestone)

Question 4

when does differential erosion occur

Answer 4

occurs as river erodes into softer rock

Question 5

how is a plunge pool carved out

Answer 5

River velocity increases as it flows over the step(due to a reduction in friction)n, carving out a plunge pool

Question 6

how does solution aid undercutting

Answer 6

as water sprays, dissolving limestone and chalk

Question 7

how does a overhang collapse

Answer 7

A band of hard rock, called an overhang, is left jutting out over the plunge pool. this overhang eventually collapses

Question 8

how does headward erosion occur

Answer 8

with repeated undercutting and overhang collapses, the water fall retreats upstream