columnar tree forms

combination pliers A tool capable of wire cutting and gripping with jaws having a hinge point and handles. The handles can be squeezed and the jaws can grasp or cut items. The hinge point has a slip point giving the jaws two adjustments as to size.

combination square A tool that may be used as a square, a level, a marking gauge, a straight edge, or a plumb that has one leg of the square capable of sliding along the other for adjustment.

combined aggregate A mixture of both fine and coarse aggregate for use in concrete mixes.

combined sewer A piping system facilitating the drainage of both storm water and sanitary sewage.

comfort station A toilet facility for public use.

commercial fertilizer 1. Any fertilizer commercially available. 2. A fertilizer that is manufactured mostly from chemicals, then mixed (sometimes with inert materials to get the proper percentage), and bagged.

common nail A nail with a wide, round, thin, flattop head and slender, sharply pointed shank for general construction purposes, especially for woodwork where finished wood is not critical. It is similar to a box nail except that its shank is not as slender as a box nail's shank. Often used for framing wood structures.

common name The name a plant is ordinarily known by that is not its botanical name (scientific name, Latin name).

common open space Land of a development, not individually owned or dedicated for public use, and designed and intended for the common use or enjoyment of the residents of the development.

common wire The ground wire in an electrical system. It completes the return path of electricity to the source.

commuter rail The portion of passenger railroad operations that carries passengers within urban areas, or between urban areas and their suburbs. It differs from railroad in that railroad passenger cars generally are heavier, the average trip lengths are usually longer, and the operations are carried out over tracks that are part of the railroad system.

compact 1. In horticulture, a plant that has a tighter branching pattern or denser, more prolific foliage, and/or is shorter than other plants of the same species. 2. In landscape and excavation, to compress and cause a reduction of voids by the pressure of heavy weight, regulated moisture, or vibration. In relation to soil, aggregate used in a base for paving. This can be accomplished and increased by mechanical compactors, by natural settling over time, or by traveling (driving or walking) over the material. Adding just the right amount of moisture will assist compaction efforts when the material is too dry. Too much moisture or too little moisture will prevent adequate compaction. Too much water will cause the soil to become plastic or

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