the process by which wind, water, ice, or gravity transports soil and sediment from one location to another
the continuous movement of water between the atmosphere, the land, and the oceans
a stream that flows into a lake or into a larger stream
the area of land that is drained by a river system
the boundary between drainage areas that have streams that flow in opposite directions
the path that a stream follows
the mass of rock overlying a geological structure
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