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Drainage Basins are open systems. This is because they are open to input from outside the system. For example: Rain which evaporated from outside the system, could travel through the atmosphere, before dropping as precipitation (rain/snow) into the drainage basin. This means extra water has entered the system.

Drainage basins also lose water. This is because all drainage basins fuel a river, which then leads to the sea. This means water escapes the system.

An example of a closed system is the hydrological cycle.

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14y ago

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