They are often found in groundwater, as a young black acid, which is found along with the high terrain or water area is that the quality of groundwater, mainly fresh water.
Usually found in groundwater age, condition is a mild acid. Which is found in areas with high terrain or drainage area. The quality of groundwater is most often a freshwater.
Often found in groundwater age, little, weak acid condition. Which found in the area with the terrain is high or catchment area. The groundwater quality that most often is the water fresh water .