Related by context. Frequent words. (Click for all words.) 67 dissolved oxygen 63 turbidity 59 sedimentation 59 acidification 56 coastal erosion 55 freshwater 55 soil moisture 55 groundwater 55 sediment 55 soils 54 atmospheric carbon dioxide 54 soil fertility 54 pH 53 estuaries 53 crop yields 52 biodiversity 52 algae blooms 52 soil erosion 52 acidity 52 seawater 51 nitrogen 51 sediments 51 tributaries 51 phytoplankton 51 rainfall 51 hydrological 50 ocean acidification 50 nutrient 50 estuary 50 marine ecosystem 50 aquifer 49 silt 49 river basins 49 tides 49 aquifers 49 marine ecosystems 49 brackish 49 temperature 49 wetland 49 water 48 Groundwater 48 vegetation 48 seagrass 48 hypoxia 48 hydrology 48 rivers 48 desertification 48 nitrate 47 invertebrates 47 phosphorus 47 sulfate 47 stormwater runoff 47 irrigated 47 habitat 47 ecosystems 47 latitudes 47 species 46 river basin 46 pollution 46 reefs 46 chlorophyll 46 climatic 46 wetlands 46 atmospheric 46 aquaculture 46 climatic conditions 46 catchments 46 lakes 46 subsidence 46 algal 46 effluent 46 reservoirs 45 conductivity 45 plankton 45 algae 45 sea 45 phosphorous 45 watersheds 45 sandy soil 45 overfishing 45 habitats 45 snowmelt 45 precipitation 45 contaminants 45 floodplain 45 acidic 45 riparian 45 temperatures 45 saline 45 bio diversity 44 irrigation 44 pollutants 44 droughts 44 oceans 44 upwelling 44 nitrates 44 storages 44 catchment 44 nutrients 44 moisture 44 anthropogenic