Translations:Adventist Youth Honors Answer Book/Nature/Environmental Conservation/13/en
From Pathfinder Wiki
b. Signs of Stream Deterioration and Death
(1) Large masses of blue-green algae present (dark green in color)
(2) Scoured banks from high water level during storms
(3) Putrid smell of the water
(4) Detergent foam present
(5) Trash sticking out of mud and sand bars along the stream
(6) Water loaded with silt
(7) No aquatic insects or fish present
(8) Presence of raw sewage
(9) Presence of oil on the surface of the water
(10) No salamanders or frogs under rocks along stream bank
(11) Stores or small factories dumping their wastes into the stream
