Water in the air occurs in three forms: gas (water vapour), liquid (cloud droplets and rain) and solid (ice crystals – snowflakes).
By changing between gas, liquid and solid, water gives us rain, snow, cloud, fog, moist air, oceans, rivers and lakes.
The way water evaporates from oceans, condenses to form clouds, then falls out as rain before flowing back as rivers to the sea is called the water cycle.
