first of all just draw a labelled diagram
then write this
-energy from the sun causes sea water and normal water to evaportate, it changes water into water vapour this process is called disstilation.
-water vapour then rises into the atmosphere. As it rises, it cools and condenses into tiny water droplets to form clouds.
-some precipitation evaporates, immediantly. It soaks into the ground, the rest of the water find its way bacl to the sea throught rocks, rivers and seas.
-the cycle starts all over again.