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Given a scientific passage and an answer, generate a question for the given answer.

Passage: In the liquid state, the hydrogen bonds of water can break and reform as the molecules flow from one place to another. When water is cooled, the molecules begin to slow down. Eventually, when water is frozen to ice, the hydrogen bonds become permanent and form a very specific network (see Figure below ). Answer: slow down
Output:
As the temperature of water decreases what happens to the speed of the water molecules?