Answer
Waves erode the coastline through;
• Back and forth movements that loosens sediments and rock
• Continuous impacts loosen sediment and rock
• Sediments scrape against one another and wear away
Step-by-step explanation
Coastal erosion occur when waves remove parts of the coastline areas. The erosion happens through corrasion, abrasion, hydraulic action, attrition and corrosion/solution. Corrasion is when waves pick up pebbles and hurl them away. Abrasion happens when breaking waves erode the shore line using sand and large fragments. In attrition process, waves cause rocks and pebbles to collide and break up. Corrosion/solution involves chemical reactions due to weak acid in the sea water.