Water
Curing (Food Preservation) / Meat
Excavation (Archaeology) / Labour Law
Fires / Mercury (Element)
Pipe (Fluid Conveyance) / Steel
Absorption (Chemistry) / Water
Wastewater / Pumping Station
Pipe (Fluid Conveyance) / Pump
Hydraulic Fracturing / Petroleum
Sun / Battery (Electricity)
Hydrochloric Acid / Salt (Chemistry)
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