Not all hardwood trees have hard wood and softwoods soft wood, because these terms denote their taxonomic ancestry, not the wood’s actual hardness.
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To learn more about this topic, start your googling with these keywords:
Angiosperm: a plant that has flowers and produces seeds enclosed within a carpel.
Gymnosperm: a plant that has seeds unprotected by an ovary or fruit.
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REFERENCES
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Botes, Christo, Steven D. Johnson, and Richard M. Cowling. “The birds and the bees: using selective exclusion to identify effective pollinators of African tree aloes.” International Journal of Plant Sciences 170.2 (2009): 151-156.
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Minea, Vasile. Industrial Heat Pump-Assisted Wood Drying. United States, CRC Press, 2018.
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Wiedenhoeft, Alex. “Structure and function of wood.” Wood handbook: wood as an engineering material: chapter 3. Centennial ed. General technical report FPL; GTR-190. Madison, WI: US Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2010: p. 3.1-3.18. 190 (2010): 3-1. https://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr190/chapter_03.pdf
WOOD Magazine Staff. “What Is the World’s Hardest Wood?” WOOD Magazine, WOOD Magazine, 17 Jan. 2019, https://www.woodmagazine.com/wood-supplies/wood-species/what-is-the-worlds-hardest-wood.