Solid iron is heated to high temperatures so that it becomes a liquid. The iron is .
In a very cold cryogenic freezer, solid oxygen forms on the walls from the oxygen gas in the air. The oxygen is .
In the high desert, snow changes to water vapor without becoming liquid water. The snow is .
Identify each of the phase changes described below. Liquid gold is poured into molds and cools to become solid bars. The gold is .
Liquid nitrogen becomes a gas when it is poured out of its container. The nitrogen is .
Water vapor in the air becomes tiny liquid droplets that form fog. The water is .
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