formation erosion waterfalls

Hydraulic action

Power of turbulent flowing water which loosens and removes bedrock

Abrasion

Bedload hits, scrapes and rubs against the riverbed. Potholes may be formed

Solution

Bedrock minerals react to acid and dissolve. Bedload structure weakended

Attrition

Bedload is worn down as stones collide against each other, they become rounded

Intro

Waterfall formation begins where the bedrock changes from hard rock to soft rock. Eroded faster

Last sentence

Combined impact of erosion processes is to form a steep drop at the hard and soft rock border