A student leaves snow-covered boots in front of the fire for many hours. When the student comes to get them, the snow is gone, and puddles of water surround the boots. Which statement correctly describes the boots after they warm by the fire?

A. The snow on the boots remains solid and unchanged.
B. The snow on the boots became a solid form of water.
C. The snow on the boots changes from a liquid to a gas.
D. The snow on the boots changes from a solid to a liquid.

The correct answer is D: The snow on the boots changes from a solid to a liquid. This change occurs as the heat from the fire melts the snow. Consequently, puddles of water form around the boots.

Explanation:

Understanding the Change of State

When the student places their snow-covered boots in front of the fire, the heat from the fire warms the boots and the snow on them. As the temperature increases, the snow undergoes a physical change due to melting. Specifically, the snow transitions from a solid state to a liquid state, resulting in water puddles surrounding the boots.

Explanation of the Options

A - This is incorrect because the snow does not remain solid; it melts.
B - This option is misleading because the snow does not become a solid form of water; it is already a solid.
C - This is incorrect as the snow does not change from liquid to gas directly; that would describe evaporation, which occurs only after melting.
D - This statement is correct; it describes the melting process, where snow (solid) turns into water (liquid).

Therefore, the correct answer is D: The snow on the boots changes from a solid to a liquid.

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