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Fault zones Faults 253 Ground water 190 Pollution 101 Noble gases 92 Radon 88 Aquifers 83 more ... Isotopes 74 Water quality 62 Geochemistry 56 Radioactive isotopes 55 Permeability 52 Soils 50 Metals 49 Sedimentary rocks 49 Surveys 48 Soil gases 47 Tectonics 45 Earthquakes 43 Hydrochemistry 43 Waste disposal 42 Pollutants 41 Rn-222 37 Concentration 35 Fractures 35 Springs 34 Active faults 32 Carbon dioxide 32 Geologic hazards 32 Water pollution 32 less ...