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Evaporation

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The process by which water changes from a liquid to a gas or vapor.

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Condensation

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The process by which water vapor in the air is changed into liquid water.

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Freezing

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The process through which a liquid turns into a solid when its temperature is lowered below its freezing point.

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Melting

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The process by which a solid turns into a liquid by heating.

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Solid

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A state of matter characterized by particles arranged such that their shape and volume are relatively stable.

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Liquid

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A state of matter with a definite volume but no fixed shape, and it can flow to fit the shape of a container.

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Gas

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A state of matter consisting of particles that have neither a defined volume nor defined shape.

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Water cycle

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The continuous movement of water on, above, and below the surface of the Earth.

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Temperature

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A measure of the warmth or coldness of an object or substance with reference to a standard value.