what are the three categories of wood?
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["Softwoods. Softwoods aren't weaker than hardwoods. ... ", 'Pine. Commercial pines are grown in plantations for timber that is denser, more resinous, and therefore more durable than spruce. ... ', 'Cedar. The most common type of cedar is the western red variety. ... ', 'Fir. ... ', 'Hardwoods. ... ', 'Oak. ... ', 'Ash. ... ', 'Beech.']
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To understand clearly, we should know what is wood. Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. ... However according to definition of wood, papaya (Carica papaya) is also a tree, which does not have wood.
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['Type I – Fire-Resistive.', 'Type II – Noncombustible.', 'Type III – Ordinary.', 'Type IV – Heavy Timber.', 'Type V – Wood Frame.']
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Cello Bow Materials The longest, most substantial portion of the cello bow is called the "stick," and can be composed of three different materials: pernambuco, a very high grade wood from Brazil, carbon fiber, and Brazilwood, which is a generic term for several types of hardwoods from Brazil.
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['Farm Forestry: Farm forestry is the management of trees for a specific purpose within a farming context. ... ', 'Agro-Forestry: ... ', 'Extension Forestry: ... ', 'Community Forestry: ... ', 'Silviculture or Scientific Forestry:']
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Natural vegetation is generally classified into three broad categories: Forests, Grasslands and Shrubs.
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Some of the more commonly used hardwoods and softwoods in making plywood are ash, maple, mahogany, Douglas fir, and several pine, cedar and spruce varieties.
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['Pine. Pine is a variety of softwood that is very easy to work with. ... ', 'Cedar. Cedar is another softwood that is very easy to use. ... ', 'Redwood. Redwood is also very resistant to moisture, so it is a great choice for outdoor furniture as well. ... ', 'Cherry. Cherry is a hardwood that is slightly more difficult to work with. ... ', 'Maple.']
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['Douglas-fir (Red Fir)', 'Englemann Spruce.', 'Grand fir (White Fir)', 'Lodgepole Pine.', 'Mountain Hemlock.', 'Pacific Yew.', 'Ponderosa Pine (Yellow Pine)', 'Subalpine fir.']
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2 Most Common Wood Species for Pallets and Why. The two most common wood types used for making pallets are southern yellow pine (SYP) and oak. A former study done by the USDA and Virginia tech determined that SYP made up 18.9% of all woods used while oak made up 17.1% (by volume).
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Mature xylem tissues are composed of three main cell types: xylem tracheary (vessel) elements, xylary fibres, and xylem parenchyma cells (Fig. 1).
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['American basswood.', 'American beech.', 'American elm.', 'Bigtooth aspen.', 'Black cherry.', 'Black maple.', 'Eastern hemlock.', 'Eastern hophornbeam.']
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['Top layer or canopy: tall deciduous trees. ... ', 'Second layer: saplings and shorter types of trees.', 'Third layer or understory: shrubs.', 'Fourth layer: forest herbs, such as wildflowers and berries. ... ', 'Fifth layer: mosses and lichens growing on tree trunks.']
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['Two 4×8, 3/8" plywood sheets.', 'One 4×8, 3/4" plywood sheet.', 'One 4×8, 1/4" masonite sheet.', "Seven 2×4 boards, 8' each long.", 'One 1\' 6" × 4\', 3/16" steel piece.', 'One 2 3/8" × 4\' steel pipe.', 'One 1lb box of 1 5/8" screws.', 'One 1lb box of 2 1/2" screws.']
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Hardwoods come from broad-leaved trees, either evergreen or deciduous, belonging to the angiosperm group. Low density wood: Under 540 kg/m³. ... Examples of low-density timbers are: Cedar (Western Red), Douglas Fir, Hemlock, Kauri-Fijian, Kavula, Lawson's Cypress Macrocarpa, Pinus Radiata, Redwood, Salu Salu, Totara.
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Softwood plywood is usually made either of cedar, Douglas fir or spruce, pine, and fir (collectively known as spruce-pine-fir or SPF) or redwood and is typically used for construction and industrial purposes.
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['Ash. There are numerous variants of ash, each with its distinctive grain patterns and hardness. ... ', 'Birch. Birch is common and inexpensive. ... ', 'Cedar. ... ', 'Cherry. ... ', 'Hickory. ... ', 'Mahogany. ... ', 'Maple. ... ', 'Oak.']