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...a form of landscaping or gardening that reduces or eliminates the need for supplemental water from irrigation. It is promoted in regions that do not have easily ac * [[Mulch]]: A layer of material applied to the surface of soil. Its purpose is to conserve moisture, improv

* [[Rocket propellant]]: A material used either directly by a rocket as the reaction mass that is ejected, typi Liquid oxygen is used in [[medicine]] to provide supplemental oxygen to patients with respiratory disorders. It is also used in the [[aer