Related by context. Frequent words. (Click for all words.) 45 arid regions 44 semi arid 43 hydrologic 42 arid 42 Chihuahuan Desert 42 Sonoran Desert 41 semiarid 41 rangeland 40 hydrology 40 drylands 40 Kitt Peak 40 geosciences 40 river basins 39 glacial melt 39 streamflow 39 aridity 38 planetary sciences 38 prolonged drought 38 hydrological cycle 38 hydrological 38 streamflows 38 geological sciences 38 aquifer recharge 37 precipitation 37 Hydrological 37 prolonged droughts 37 terrestrial ecosystems 37 polar caps 37 Arizona 37 Hydrology 37 climatology 37 atmospheric sciences 36 rangelands 36 catastrophic wildfires 36 snowpack 36 groundwater pumping 36 John Husing 36 drier 36 Sonoran desert 36 droughts 36 Kaibab 36 climatological 36 Desertification 35 Water Resources 35 Kris Mayes 35 forest ecosystems 35 subtropical regions 35 Soil moisture 35 Lake Tahoe Basin 35 Geologic Survey 35 Northwest Interagency Coordination 35 snowmelt 34 wetter 34 Santa Catalina Mountains 34 prescribed burns 34 driest 34 frequent droughts 34 cheatgrass 34 Natural Resources Conservation 34 ecology 34 Atmospheric Sciences 33 Climatology 33 Severe drought 33 grasslands 33 soils 33 glacier melt 33 wildland 33 Tahoe Basin 33 wildfire suppression 33 sagebrush 33 Deserts 33 Salinity 33 River basin 33 wildland fire 33 seismology 33 desert 33 karst 32 arid desert 32 Mount Lemmon 32 desertification 32 irrigated agriculture 32 USGS 32 biodiversity 32 Gov. Janet Napolitano 32 ecosystems 32 Groundwater 32 groundwater 32 hydrogeology 32 drought stricken 32 Edwards Aquifer 32 Geological Sciences 32 Mark Baldassare 32 geoscience 32 meteorological 32 Hydrologists 32 evapotranspiration 32 geology 32 groundwater recharge 32 Claes Fornell 32 conservation 32 ecologist