Groundwater Sapping and Fluvial Erosion

1
Groundwater Sapping and Fluvial Erosion
2
What are the similarities and differences between
the two images?
3
Which picture would best represent surface
run-off? Which picture would best represent
groundwater sapping?
4
Which picture would best represent surface
run-off? Which picture would best represent
groundwater sapping?
Run-off (Earth)
Sapping (Mars)