Water is essential for all life on this planet. Just fewer than three-quarters of the Earth is covered in water. We commonly think of water as being a liquid that we find in our rivers, streams, and oceans. Water is actually in many places at once. Right now those bodies of water are evaporating into water vapor. Plants are giving off lots of water as they undergo the process of photosynthesis and it is evaporating as well. That water is being cooled and slowly forming clouds. Once the clouds become heavily filled with water they give off liquid water in the form of rain, sleet, or snow.
The worksheets include atmospheric currents and the movement of water through its various forms. We follow the water as the sun heats the water and leaves the ground through the process of evaporation and at the same time plants are transpiring as a result of photosynthesis and giving off their own vapor. The water rises up and condenses into clouds. The clouds rise and get colder and then rain or snow (precipitation) forms and the water returns to the Earth.