The shape of the United States is not what you see on a map, but rather your mental picture of what you can explore, blocked by other people.
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Rain (Wikipedia)Rain is water droplets that have condensed from atmospheric water vapor and then fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides water for hydroelectric power plants, crop irrigation, and suitable conditions for many types of ecosystems.