Water can be a liquid or a solid and can go back and forth from one
form to the other. If water is turned into ice and then the ice is allowed
to melt, the amount of water is the same as it was before freezing.
| NSES Content Standard B
Physical Science: Properties of objects and materials Grades K-4, page 127 Materials can exist in different states--solid, liquid, and gas. Some common materials, such as water, can be changed from one state to another by heating or cooling. |