term variable
term
variable
biodiversity endangered species protected species rare species species extinction species recovery threatened species biogeochemical cycles carbon cycle methane cycle nitrogen cycle nitrous oxide cycle phosphorus cycle sulfur cycle biota animals microorganisms plants chemical processes fixation hydration ion exchange oxidation reduction release weathering ecological dynamics adaptation competition distributions extinction mutation selection succession survival human activities cultural features hydrologic processes acid precipitation aquifer recharge evaporation evapotranspiration hydrologic cycle infiltration ion exchange percolation precipitation amount precipitation rate run-off saltwater intrusion stream discharge stream flow land productivity land capability land capability classes land characteristics land classes land drainage land fertility land management land resources land suitability land tenure landforms land processes desertification land degradation land deposition land erosion land sedimentation soils organic matter soil associations soil characteristics soil chemistry soil color soil compaction soil consistency soil degradation soil deposition soil depth soil erosion soil fertility soil mechanics soil moisture soil moisture regime soil plasticity soil porosity soil processes soil productivity soil salinization soil sedimentation soil structure soil temperature soil texture soil types soil variability soil water status soil water storage capacity water characteristics flow rates water capability water content water features water yield
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