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Across 4. The amount of matter an object contains. 5. Describes a substance that is usually a solid or liquid when at room temperature. 6. Has a definite volume and shape. 7. Has a definite volume but takes the shape of its container. 8. When a solid changes to a liquid. 10. A mixture that has distinctive phases. 12. Anything with mass that takes up space. 13. When a liquid changes to a solid.

Down 1. When a liquid changes to a gas. 2. When an object goes directly from a solid to a gas. 3. When a gas changes to a liquid. 9. A possible explanation or descriptive model used to explain the observation. 11. Fills the volume of their container and takes the shape.