Related by context. Frequent words. (Click for all words.) 66 groundwater aquifers 59 Aquifers 59 aquifers 59 soils 58 groundwater 58 shallow aquifer 58 Sediments 57 silts 57 embayment 56 alluvial deposits 56 sediments 56 aquifer 56 placer deposits 55 wastewater effluent 55 total dissolved solids 55 acidic soils 54 tailing ponds 54 wastewaters 54 salinity 54 sewage effluent 54 carbonic acid 53 freshwater ecosystems 53 sediment 53 surficial 53 brines 53 acidify 53 wellfields 53 contaminating groundwater 53 inter tidal 53 iron oxides 53 marine sediments 53 sedimentation 53 sulphates 53 sulphate 53 headwater streams 52 subsurface 52 seabeds 52 reservoir 52 evaporation ponds 52 settling ponds 52 wetland ecosystems 52 reservoirs 52 biota 52 monazite 52 underground aquifer 52 mineral salts 52 tailings dams 52 leachable 52 calcrete 52 watersheds 52 DBPs 51 nitrification 51 hydrological cycle 51 magmas 51 underground aquifers 51 clathrates 51 salination 51 Soil erosion 51 aquatic invertebrates 51 gravels 51 calcareous 51 aquatic ecosystems 51 Floridan Aquifer 51 fertile soils 51 hydrothermal activity 51 iron manganese 51 arsenic concentrations 51 basaltic 51 phytoplankton blooms 51 seawaters 51 porosities 51 sulfide 51 seawater 51 tailings 51 streambeds 51 Turbidity 50 artesian wells 50 lakes 50 glacial till 50 dissolved solids 50 alkalinity 50 deltaic 50 intertidal zone 50 Great Artesian Basin 50 lavas 50 filtrate 50 groundwater recharge 50 silty 50 fracturing fluids 50 contaminate groundwater 50 basalts 50 deplete oxygen 50 geologic formations 50 carbonate reservoirs 50 aquatic ecosystem 50 mine tailings 50 Sulfide 50 sandy soils 50 brackish water 50 biogenic 49 brackish