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1: Active solar heating system 2: Soil 3: Community 4: Human 5: Water 6: Environment 7: Lead 8: Feeder 9: Condition 10: Range 11: Process 12: Carbon 13: Contamination 14: Plant 15: Animal 16: Electricity 17: Change 18: Ecosystem 19: Conservation 20: Development (As of 05:29)
Unconfined ground water is water in an Aquifer that has a water table that is exposed to the atmosphere. See confined ground water