Erosion

Question 1

Abrasion

Answer 1

Sand and pebbles get dragged along the river bed, or knock into it as they bounce along in the water, wearing away at that channel

Question 2

Attrition

Answer 2

Rocks and stones moving along in the water knock together and help to wear each other away

Question 3

Hydraulic action

Answer 3

Fast-flowing water pushes air into cracks, and sheer force of this breaks up the channel overtime

Question 4

Solution

Answer 4

Water dissolves minerals form the river bed and banks, this helps break up the channel