Materials come in different states, including solids, liquids, and gases. As a basis for understanding this concept, students:
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Recognize that solids have a definite shape; liquids and gases take the shape of their containers.
Recognize that materials can be manipulated to change some of their properties (e.g., cooling or heating).
Investigate and explain that water, like many other substances, can be a liquid, a solid, or a gas, and it can transform from one state to another.
Explain how water can be transformed from one state to another by adding or taking away heat energy.
Describe when water is frozen into ice and the ice is allowed to melt, the amount of water is the same as it was at the beginning.