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Water.

Acts on	Aggregate.
has_property	../conservation/water_quality.
has_property	Water_flow.
has_type	Acid_water.
has_type	Brackish_water.
has_type	Flowing_water.
has_type	Fresh_water.
has_type	Frozen_water.
has_type	Ground_water.
has_type	No_water.
has_type	Sea.
has_type	Still_water.
has_type	Surface_water.
is_part_of	Geography.
Quality	http://www.google.com/Top/Science/Environment/Water_Resources/Water_Quality/
Treatment	http://www.google.com/Top/Society/Issues/Health/Water_Treatment/
Water quality indicators