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2. Hydroponics - Wikipedia

   en.wikipedia.org/wiki/Hydroponics

   A hole is cut (or drilled) in the top of the reservoir for each plant; if it is a jar or tub, it may be its lid, but otherwise, cardboard, foil, paper, wood or metal may be put on top. A single reservoir can be dedicated to a single plant, or to various plants.

3. Retaining wall - Wikipedia

   en.wikipedia.org/wiki/Retaining_wall

   The structure is constructed to resist the lateral pressure of soil when there is a desired change in ground elevation that exceeds the angle of repose of the soil. [ 1 ] A basement wall is thus one kind of retaining wall; however, the term usually refers to a cantilever retaining wall, which is a freestanding structure without lateral support ...

4. Planter (farm implement) - Wikipedia

   en.wikipedia.org/wiki/Planter_(farm_implement)

   A two row planter featuring John Deere "71 Flexi" row units John Deere MaxEmerge XP Planter with Case IH AFS precision farming system which auto-steers using GPS A Kinze 2200 planter. A planter is a farm implement, usually towed behind a tractor, that sows (plants) seeds in rows throughout a field.

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

6. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

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