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There is salt in every lake, river and stream in the hydrosphere. But the water in a lake is still freshwater because the concentration of the salt in most freshwater is extremely low, so it isn't noticable. Most lakes rivers and streams exchange water with other sources, and they also receive surface runoff, and groundwater flow, so the water is constantly being diluted. So a lake must either receive groudwater flow or surface runoff to contain freshwater.

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16y ago

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