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1: Active solar heating system 2: Soil 3: Community 4: Human 5: Feeder 6: Lead 7: Water 8: Environment 9: Range 10: Current 11: Condition 12: Process 13: Carbon 14: Atom 15: Electricity 16: Contamination 17: Plant 18: Fishery 19: Hazard 20: Conservation (As of 21:30)
A Particulate Matter is a tiny (microscopic) matter in the atmosphere. It might be solid or liquid.
