Matter has mass and takes up space. Matter exists in a solid, liquid or gas state and can change forms. Heating and cooling can change the properties of matter. Two or more materials can be combined to form a new substance that has properties different from the original materials. Water is a type of matter.
Water has surface tension, which is the result of water molecules adhering to one another.
Substances that are less dense than water will float in water. Substances that are more dense than water will sink in water. The water cycle consists of evaporation, condensation, precipitation and accumulation. The sun is the source of energy that drives the water cycle. The earth has all the water it will ever have.