what is rainwater harvesting????? short answer.
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Rainwater harvesting system, also called rainwater collection system or rainwater catchment system, technology that collects and stores rainwater for human use. Rainwater harvesting systems range from simple rain barrels to more elaborate structures with pumps, tanks, and purification systems.
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There
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