Erosion

Question 1

Abrasion

Answer 1

Rocks roll along the riverbed, scraping in a sandpaper-like effect to become smaller, smoother and rounder

Question 2

Hydraulic Action

Answer 2

Water forces itself into cracks in rocks and pressurises, expanding these cracks and breaking down rocks

Question 3

Solution

Answer 3

Soluble rocks, like limestone are dissolved into the river’s water

Question 4

Attrition

Answer 4

Rocks smash against each other to become smaller, smoother and rounder