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How is a lake or river that freezes over helpful to the organisms in the water?

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When the surface of a lake or a river freezes, the ice serves as a barrier between the water and the cold air above. The temperature of the water below the ice is kept at a stable level, and it allows the organisms in the water to survive at a sustainable temperature. It also prevents further freezing of the water body and allows the organisms to stay in motion.

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