Final answer:
Water vapor in the atmosphere plays a vital role in cloud formation, the greenhouse effect, and the global hydrologic cycle.
Explanation:
Water vapor in the atmosphere is significant for various reasons. It plays a crucial role in forming clouds and rain, impacting Earth's temperature through the greenhouse effect, and contributing to the hydrologic cycle. Warmer air can hold more water vapor due to the Clausius-Clapeyron relation, affecting climate patterns worldwide.
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