water enters and continually cycles around the earth through the global hydrological cycle, it is a closed system with no inputs or outputs
there are also local hydrological cycles e.g. drainage basin hydrological cycles
a rivers drainage basin is the area surrounding the river where the rain falling on the land flows into that river- also called the rivers catchment
the boundary of the drainage basin is the watershed- any precipitation falling beyond the watershed enters a different basin
drainage basins are open systems with inputs and outputs
water come into the system as precipitation and leaves via evaporation, transpiration and river discharge
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