Corrasion		Bouncing along the seabed.
Attrition		The rocks collide and BASH into each other and make eachother smaller, smoother and rounder.
Solution		Sandpaper, rocks are being scraped against things and GROUND away.
Hydraulic Action		Dissolved particles being held in the water.
TRACTION		Solution uses the acids in the seawater to erode rocks with calcium like chalk and limestone.
SALTATION		The sheer force of the water erodes in hydraulic action and the air that is being compressed inside the crack also helps to erode.
SUSPENSION		Solution uses the acids in the seawater to erode rocks with calcium like chalk and limestone.
SOLUTION		Being dragged or rolled along the seabed.