Evaporation
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Evaporation is the spontaneous process of molecules changing from a liquid to a gaseous state.
Water (and, oddly, magma) with a depth of one will slowly disappear. Outdoor water of any depth will evaporate (and possibly disappear completely) during hot or dry seasons.
Deeper water seems to lose water at a slower rate: Over a couple of seasons, a depth 2 pool has been observed to vanish completely while a depth 5 pool didn't lose any water at all.

