Which source has the widest range of residence time

Underground water source

Explanation:

Underground water source has the widest range of residence time. Underground water are usually present deep under the ground and are formed from the rainfall seeping into the soil and remaining there. Evaporation takes a bit of the water and the remaining are usually present for a very long time.

Underground water residence time usually ranges between few weeks to a thousand years which depicts a very wide range.

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