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274780
WATERFALL
Description
Formation of a waterfall. Fluvial landform of erosion.
No tags specified
geography
lc
physical
geography
physical
leaving certificate
Mind Map by
Jamie Healy
, updated more than 1 year ago
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Created by
Jamie Healy
about 11 years ago
231
7
0
Resource summary
WATERFALL
FLUVIAL EROSION
Youthful Stage of a River
interruption in river profile, vertical drop
River meets band of soft rock after flowing over hard rock
>differential erosion, hydraulic action, abrasion
cuts downwards into soft rock, steepening gradient
falling water hitting soft rock forms PLUNGE POOL beneath fall
drop= extra velocity
falling water undercuts soft rock by hydraulic action= OVERHANG
HARD rock deeply undercut> collapses
repeated many times> headward erosion of waterfall
waterfall retreats upstream > GORGE
waterfall is temporary, headword erosion will result in developing regular profile
NIAGARA FALLS= GORGE
Pollaphouca falls, river liffey, co wicklow
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