Fire- is a heat, everything starts with the fire, you need a fire to start off. But fire needs a space to burn, to give force to its growth. So Space helps in providing the nourishment to the fire without interfering and help fire fulfill it desire. But if fire can be a blast to work negatively, then the water is needed to control the fire.
Water can control and stop fire. It simply extinguishes it.
Water is the smooth flowing element, with flexibility, but it requires the base to balance them and help them moving in a proper direction, the earth creating banks for them so they move in proper direction and become river, lake, then ultimately reach the ocean.
So the movement of the water is controlled by earth.
Air is the support hunger of the water. The chemical composition is H2O, It creates a support platform for the water.
Air is movement, it has to continuous movement,Earth gives it a grounding to stay, lets it move as it wants. The fire controls the movement of air, it burns up all the air.
Earth is controlled by space, it holds its movements into certain direction they want.
The fire gives nourishment to the earth with its heat and light and helping in growth.
Whats your element, know your element and your support system.