Answer:
Well here is the steps in order. :) No worries on the subject. <3
1.) Particles gain kinetic energy and move further apart.
2.) The heated fluid becomes less dense. Less dense material rises.
3.) The material moves away from the heat source and the particles lose kinetic energy.
4.) The particles come closer together and the material becomes denser.
5.) The dense material falls downwards and a convection current is formed.