Space aliens visited you last night and left you with a "present". They left behind a liter of shimmering blue substance. This substance is liquid at room temperature, but when you place it in a refrigerator it turns to a shimmering blue solid. When you take it back out of the refrigerator, it turns into a shimmering blue liquid again. What kind of change (chemical or physical) most likely occurred? Explain why to support your answer. Use evidence from the text to support your answer.

Space aliens visited you last night and left you with a "present". They left behind a liter of shimmering blue substance. This substance is liquid at room temperature, but when you place it in a refrigerator it turns to a shimmering blue solid. When you take it back out of the refrigerator, it turns into a shimmering blue liquid again. What kind of change (chemical or physical) most likely occurred? Explain why to support your answer. Use evidence from the text to support your answer.