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Fault zones Faults 257 Ground water 194 Pollution 104 Noble gases 94 Radon 90 Aquifers 85 more ... Isotopes 75 Water quality 63 Geochemistry 57 Radioactive isotopes 56 Permeability 53 Sedimentary rocks 52 Metals 51 Soils 50 Soil gases 48 Surveys 48 Tectonics 45 Earthquakes 44 Hydrochemistry 44 Pollutants 43 Waste disposal 42 Fractures 37 Rn-222 37 Concentration 36 Springs 34 Active faults 33 Carbon dioxide 32 Geologic hazards 32 Water pollution 32 less ...