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 . Solid iron is heated to high temperatures so that it becomes a liquid. The iron is . Water vapor in the air becomes tiny liquid droplets that form fog. The water 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

Explanation:

The Question is to Identify each of the phase changes described.

Liquid gold is poured into molds and cools to become solid bars.

Phase Change -> Solidification

Liquid nitrogen becomes a gas when it is poured out of its container.

Phase Change -> Vapourization

Solid iron is heated to high temperatures so that it becomes a liquid.

Phase Change -> Melting

Water vapor in the air becomes tiny liquid droplets that form fog.

Phase Change -> Vapourization

In a very cold cryogenic freezer, solid oxygen forms on the walls from the oxygen gas in the air.

Phase Change -->  Deposition

In the high desert, snow changes to water vapor without becoming liquid water.

Phase Change --> Sublimation

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